Don't generate line&scope debug info for meta-instructions.

MachineInstructions that don't generate any code (such as
IMPLICIT_DEFs) should not generate any debug info either.

Fixes PR33107.

https://bugs.llvm.org/show_bug.cgi?id=33107

This reapplies r303566 without any modifications. The stage2 build
failures persisted even after reverting this patch, and looking back
through history, it looks like these tests are flaky.

llvm-svn: 303575

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
index 826162ad47c..27ae77b18cd 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
@@ -223,9 +223,9 @@ void DebugHandlerBase::endInstruction() {
     return;
 
   assert(CurMI != nullptr);
-  // Don't create a new label after DBG_VALUE instructions.
-  // They don't generate code.
-  if (!CurMI->isDebugValue()) {
+  // Don't create a new label after DBG_VALUE and other instructions that don't
+  // generate code.
+  if (!CurMI->isMetaInstruction()) {
     PrevLabel = nullptr;
     PrevInstBB = CurMI->getParent();
   }