Disable fatal errors in the Verifier instantiated by bugpoint's crash

debugger.

When bugpoint hacks at a testcase it may at one point create illegal
debug info metadata that won't even pass the Verifier. A bugpoint
*driver* built with assertions should not assert on it, but reject the
malformed intermediate step and continue to do its job.

llvm-svn: 284490

Author: adrian-prantl

llvm/test/BugPoint/invalid-debuginfo.ll

@@ -0,0 +1,22 @@
+; RUN: bugpoint -load %llvmshlibdir/BugpointPasses%shlibext %s -output-prefix %t -bugpoint-crash-too-many-cus -silence-passes 2>&1 | FileCheck %s
+; REQUIRES: loadable_module
+; CHECK: All DICompileUnits must be listed in llvm.dbg.cu
+
+; When bugpoint hacks at this testcase it will at one point create illegal IR
+; that won't even pass the Verifier. A bugpoint *driver* built with assertions
+; should not assert on it, but reject the malformed intermediate step.
+define void @f() !dbg !9 { ret void }
+!llvm.dbg.cu = !{!0, !1, !2, !3, !4, !5}
+!0 = distinct !DICompileUnit(language: 12, file: !6)
+!1 = distinct !DICompileUnit(language: 12, file: !6)
+!2 = distinct !DICompileUnit(language: 12, file: !6)
+!3 = distinct !DICompileUnit(language: 12, file: !6)
+!4 = distinct !DICompileUnit(language: 12, file: !6)
+!5 = distinct !DICompileUnit(language: 12, file: !6)
+!6 = !DIFile(filename: "path/to/file", directory: "/path/to/dir")
+
+!llvm.module.flags = !{!7, !8}
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+
+!9 = distinct !DISubprogram(unit: !0)

llvm/tools/bugpoint/CrashDebugger.cpp

@@ -733,7 +733,7 @@ bool ReduceCrashingInstructions::TestInsts(
 
   // Verify that this is still valid.
   legacy::PassManager Passes;
-  Passes.add(createVerifierPass());
+  Passes.add(createVerifierPass(/*FatalErrors=*/false));
   Passes.run(*M);
 
   // Try running on the hacked up program...
@@ -809,7 +809,7 @@ bool ReduceCrashingNamedMD::TestNamedMDs(std::vector<std::string> &NamedMDs) {
 
   // Verify that this is still valid.
   legacy::PassManager Passes;
-  Passes.add(createVerifierPass());
+  Passes.add(createVerifierPass(/*FatalErrors=*/false));
   Passes.run(*M);
 
   // Try running on the hacked up program...
@@ -876,7 +876,7 @@ bool ReduceCrashingNamedMDOps::TestNamedMDOps(
 
   // Verify that this is still valid.
   legacy::PassManager Passes;
-  Passes.add(createVerifierPass());
+  Passes.add(createVerifierPass(/*FatalErrors=*/false));
   Passes.run(*M);
 
   // Try running on the hacked up program...