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Lang Hames
558b52b517
SymbolStringPtr used to use nullptr as its empty value and (since it performed ref-count operations on any non-nullptr) a pointer to a special pool-entry instance as its tombstone. This commit changes the scheme to use two invalid pointer values as the empty and tombstone values, and broadens the ref-count guard to prevent ref-counting operations from being performed on these pointers. This should improve the performance of SymbolStringPtrs used in DenseMaps/DenseSets, as ref counting operations will no longer be performed on the tombstone. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360925 91177308-0d34-0410-b5e6-96231b3b80d8
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