[Orc] Add a SymbolStringPool data structure for efficient storage and fast
comparison of symbol names.

SymbolStringPool is a thread-safe string pool that will be used in upcoming Orc
APIs to facilitate efficient storage and fast comparison of symbol name strings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319839 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed