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f5e0674d06
Shave a pointer off of `MCSymbolName` by storing `StringMapEntry<bool>*` instead of `StringRef`. This brings `sizeof(MCSymbol)` down to 64 on 64-bit platforms, a nice round number. My profile showed memory dropping from 914 MB down to 908 MB, roughly 0.7%. Other than memory usage, no functionality change here. (I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`; see r236629 for details.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238005 91177308-0d34-0410-b5e6-96231b3b80d8
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