[NFC][Utils] Eliminate DISubprogram set from BuildDebugInfoMDMap (#118625)

Summary:
Previously, we'd add all SPs distinct from the cloned one into a set.
Then when cloning a local scope we'd check if it's from one of those
'distinct' SPs by checking if it's in the set. We don't need to do that.
We can just check against the cloned SP directly and drop the set.

Test Plan:
ninja check-llvm-unit check-llvm

1 files changed, 2 insertions, 5 deletions

diff --git a/llvm/lib/Transforms/Utils/CloneFunction.cpp b/llvm/lib/Transforms/Utils/CloneFunction.cpp
index d47633a..8863dff 100644
--- a/llvm/lib/Transforms/Utils/CloneFunction.cpp
+++ b/llvm/lib/Transforms/Utils/CloneFunction.cpp
@@ -172,18 +172,15 @@ bool llvm::BuildDebugInfoMDMap(DenseMap<const Metadata *, TrackingMDRef> &MD,
     };
 
     // Avoid cloning types, compile units, and (other) subprograms.
-    SmallPtrSet<const DISubprogram *, 16> MappedToSelfSPs;
     for (DISubprogram *ISP : DIFinder.subprograms()) {
-      if (ISP != SPClonedWithinModule) {
+      if (ISP != SPClonedWithinModule)
         mapToSelfIfNew(ISP);
-        MappedToSelfSPs.insert(ISP);
-      }
     }
 
     // If a subprogram isn't going to be cloned skip its lexical blocks as well.
     for (DIScope *S : DIFinder.scopes()) {
       auto *LScope = dyn_cast<DILocalScope>(S);
-      if (LScope && MappedToSelfSPs.count(LScope->getSubprogram()))
+      if (LScope && LScope->getSubprogram() != SPClonedWithinModule)
         mapToSelfIfNew(S);
     }