[DebugInfo] Refactor DbgInfoIntrinsic class hierarchy.

In the past, DbgInfoIntrinsic has a strong assumption that these
intrinsics all have variables and expressions attached to them.
However, it is too strong to derive the class for other debug entities.
Now, it has problems for debug labels.

In order to make DbgInfoIntrinsic as a base class for 'debug info', I
create a class for 'variable debug info', DbgVariableIntrinsic.

DbgDeclareInst, DbgAddrIntrinsic, and DbgValueInst will be derived from it.

Differential Revision: https://reviews.llvm.org/D50220

llvm-svn: 338984

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Scalar/ADCE.cpp b/llvm/lib/Transforms/Scalar/ADCE.cpp
index d134a158073..61c4be854da 100644
--- a/llvm/lib/Transforms/Scalar/ADCE.cpp
+++ b/llvm/lib/Transforms/Scalar/ADCE.cpp
@@ -508,7 +508,7 @@ bool AggressiveDeadCodeElimination::removeDeadInstructions() {
       if (isLive(&I))
         continue;
 
-      if (auto *DII = dyn_cast<DbgInfoIntrinsic>(&I)) {
+      if (auto *DII = dyn_cast<DbgVariableIntrinsic>(&I)) {
         // Check if the scope of this variable location is alive.
         if (AliveScopes.count(DII->getDebugLoc()->getScope()))
           continue;