[Utils] Avoid a hash table lookup in salvageDI, NFC
According to the current coverage report salvageDebugInfo() is called
5.12 million times during testing and almost always returns early.
The early return depends on LocalAsMetadata::getIfExists returning null,
which involves a DenseMap lookup in an LLVMContextImpl. We can probably
speed this up by simply checking the IsUsedByMD bit in Value.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325738 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed