diff --git a/clang/test/CodeGen/thinlto-distributed-newpm.ll b/clang/test/CodeGen/thinlto-distributed-newpm.ll
index c85ce0f6a27da..9967586fea9bc 100644
--- a/clang/test/CodeGen/thinlto-distributed-newpm.ll
+++ b/clang/test/CodeGen/thinlto-distributed-newpm.ll
@@ -1,7 +1,12 @@
 ; FIXME: This test should use CHECK-NEXT to keep up-to-date.
 ; REQUIRES: x86-registered-target
 
-; Validate ThinLTO post link pipeline at O2 and O3
+;; Validate that we set up the ThinLTO post link pipeline at O2 and O3
+;; for a ThinLTO distributed backend invoked via clang.
+;; Since LLVM tests already more thoroughly test this pipeline, and to
+;; avoid making this clang test too sensitive to LLVM pipeline changes,
+;; here we simply confirm that an LTO backend-specific pass is getting
+;; invoked (WPD).
 
 ; RUN: opt -thinlto-bc -o %t.o %s
 
@@ -17,94 +22,9 @@
 ; RUN: %clang -target x86_64-grtev4-linux-gnu \
 ; RUN:   -O3 -Xclang -fdebug-pass-manager \
 ; RUN:   -c -fthinlto-index=%t.o.thinlto.bc \
-; RUN:   -o %t.native.o -x ir %t.o 2>&1 | FileCheck -check-prefixes=CHECK-O,CHECK-O3 %s --dump-input=fail
+; RUN:   -o %t.native.o -x ir %t.o 2>&1 | FileCheck -check-prefixes=CHECK-O %s --dump-input=fail
 
 ; CHECK-O: Running pass: WholeProgramDevirtPass
-; CHECK-O: Running pass: LowerTypeTestsPass
-; CHECK-O: Running pass: PGOIndirectCallPromotion
-; CHECK-O: Running pass: InferFunctionAttrsPass
-; CHECK-O: Running pass: LowerExpectIntrinsicPass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: SROAPass on main
-; CHECK-O: Running pass: EarlyCSEPass on main
-; CHECK-O3: Running pass: CallSiteSplittingPass on main
-; CHECK-O: Running pass: LowerTypeTestsPass
-; CHECK-O: Running pass: IPSCCPPass
-; CHECK-O: Running pass: CalledValuePropagationPass
-; CHECK-O: Running pass: GlobalOptPass
-; CHECK-O: Running pass: PromotePass
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: InlinerPass on (main)
-; CHECK-O: Running pass: PostOrderFunctionAttrsPass on (main)
-; CHECK-O3: Running pass: ArgumentPromotionPass on (main)
-; CHECK-O: Running pass: SROAPass on main
-; CHECK-O: Running pass: EarlyCSEPass on main
-; CHECK-O: Running pass: SpeculativeExecutionPass on main
-; CHECK-O: Running pass: JumpThreadingPass on main
-; CHECK-O: Running pass: CorrelatedValuePropagationPass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O3: Running pass: AggressiveInstCombinePass on main
-; CHECK-O: Running pass: LibCallsShrinkWrapPass on main
-; CHECK-O: Running pass: TailCallElimPass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: ReassociatePass on main
-; CHECK-O: Running pass: LoopSimplifyPass on main
-; CHECK-O: Running pass: LCSSAPass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O: Running pass: LoopSimplifyPass on main
-; CHECK-O: Running pass: LCSSAPass on main
-; CHECK-O: Running pass: SROAPass on main
-; CHECK-O: Running pass: MergedLoadStoreMotionPass on main
-; CHECK-O: Running pass: GVNPass on main
-; CHECK-O: Running pass: SCCPPass on main
-; CHECK-O: Running pass: BDCEPass on main
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O: Running pass: JumpThreadingPass on main
-; CHECK-O: Running pass: CorrelatedValuePropagationPass on main
-; CHECK-O: Running pass: ADCEPass on main
-; CHECK-O: Running pass: MemCpyOptPass on main
-; CHECK-O: Running pass: DSEPass on main
-; CHECK-O: Running pass: LoopSimplifyPass on main
-; CHECK-O: Running pass: LCSSAPass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O: Running pass: DeadArgumentEliminationPass
-; CHECK-O: Running pass: GlobalOptPass
-; CHECK-O: Running pass: GlobalDCEPass
-; CHECK-O: Running pass: EliminateAvailableExternallyPass
-; CHECK-O: Running pass: ReversePostOrderFunctionAttrsPass
-; CHECK-O: Running pass: RecomputeGlobalsAAPass
-; CHECK-O: Running pass: Float2IntPass on main
-; CHECK-O: Running pass: LowerConstantIntrinsicsPass on main
-; CHECK-O: Running pass: LoopSimplifyPass on main
-; CHECK-O: Running pass: LCSSAPass on main
-; CHECK-O: Running pass: LoopRotatePass on b
-; CHECK-O: Running pass: LoopDistributePass on main
-; CHECK-O: Running pass: InjectTLIMappings on main
-; CHECK-O: Running pass: LoopVectorizePass on main
-; CHECK-O: Running pass: LoopLoadEliminationPass on main
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: SLPVectorizerPass on main
-; CHECK-O: Running pass: VectorCombinePass on main
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O: Running pass: LoopUnrollPass on main
-; CHECK-O: Running pass: WarnMissedTransformationsPass on main
-; CHECK-O: Running pass: InstCombinePass on main
-; CHECK-O: Running pass: LoopSimplifyPass on main
-; CHECK-O: Running pass: LCSSAPass on main
-; CHECK-O: Running pass: LICMPass on b
-; CHECK-O: Running pass: AlignmentFromAssumptionsPass on main
-; CHECK-O: Running pass: LoopSinkPass on main
-; CHECK-O: Running pass: InstSimplifyPass on main
-; CHECK-O: Running pass: DivRemPairsPass on main
-; CHECK-O: Running pass: SimplifyCFGPass on main
-; CHECK-O: Running pass: GlobalDCEPass
-; CHECK-O: Running pass: ConstantMergePass
-; CHECK-O: Running pass: CGProfilePass
 
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-grtev4-linux-gnu"