[SYCL] Fix module changes detection in LowerWGScope pass (#5292)

Also explicitly updated tests, which fail without pipeline adjustments to get
better test coverage.

Signed-off-by: Mikhail Lychkov <mikhail.lychkov@intel.com>
Co-authored-by: Alexey Sachkov <alexey.sachkov@intel.com>

llvm/lib/SYCLLowerIR/LowerWGScope.cpp

@@ -766,7 +766,6 @@ PreservedAnalyses SYCLLowerWGScopePass::run(Function &F,
                                             FunctionAnalysisManager &FAM) {
   if (!F.getMetadata(WG_SCOPE_MD))
     return PreservedAnalyses::all();
-  bool Changed = false;
   const auto &TT = llvm::Triple(F.getParent()->getTargetTriple());
   // Ranges of "side effect" instructions
   SmallVector<InstrRange, 16> Ranges;
@@ -827,7 +826,7 @@ PreservedAnalyses SYCLLowerWGScopePass::run(Function &F,
       Ranges.push_back(InstrRange{First, Last});
     }
   }
-#ifndef NDEBUG
+
   int NByval = 0;
   for (const auto &Arg : F.args()) {
     if (Arg.hasByValAttr())
@@ -836,17 +835,17 @@ PreservedAnalyses SYCLLowerWGScopePass::run(Function &F,
 
   bool HaveChanges = (Ranges.size() > 0) || (Allocas.size() > 0) || NByval > 0;
 
+#ifndef NDEBUG
   if (HaveChanges && Debug > 1) {
     dumpIR(F, "before");
     dumpDot(F, "before");
   }
 #endif // NDEBUG
 
   // Perform the transformation
-  for (auto &R : Ranges) {
+  for (auto &R : Ranges)
     tformRange(R, TT);
-    Changed = true;
-  }
+
   // There can be allocas not corresponding to any variable declared in user
   // code but generated by the compiler - e.g. for non-trivially typed
   // parameters passed by value. There can be WG scope stores into such
@@ -879,7 +878,7 @@ PreservedAnalyses SYCLLowerWGScopePass::run(Function &F,
     dumpDot(F, "after");
   }
 #endif // NDEBUG
-  return Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
+  return HaveChanges ? PreservedAnalyses::none() : PreservedAnalyses::all();
 }
 
 GlobalVariable *spirv::createWGLocalVariable(Module &M, Type *T,

llvm/test/SYCLLowerIR/byval_arg.ll

@@ -1,4 +1,5 @@
-; RUN: opt < %s -LowerWGScope -S | FileCheck %s
+; RUN: opt < %s -LowerWGScope -S -enable-new-pm=0 | FileCheck %s
+; RUN: opt < %s -passes=LowerWGScope -S | FileCheck %s
 
 ; Check that argument of the function marked with !work_group_scope
 ; attribute passed as byval is shared by leader work item via local

llvm/test/SYCLLowerIR/convergent.ll

@@ -1,5 +1,8 @@
-; RUN: opt < %s -LowerWGScope -S | FileCheck %s
-; RUN: opt < %s -LowerWGScope --mtriple=nvptx -S | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-PTX
+; RUN: opt < %s -LowerWGScope -S -enable-new-pm=0 | FileCheck %s
+; RUN: opt < %s -LowerWGScope --mtriple=nvptx -S -enable-new-pm=0 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-PTX
+
+; RUN: opt < %s -passes=LowerWGScope -S | FileCheck %s
+; RUN: opt < %s -passes=LowerWGScope --mtriple=nvptx -S | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-PTX
 
 
 %struct.baz = type { i64 }