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c5f2ba0401
Turn `MCSymbolData` into a field inside of `MCSymbol`. Keep all the old API alive for now, so that consumers can be updated in a later commit. This means we still temporarily need the back pointer from `MCSymbolData` to `MCSymbol`, but I'll remove it in a follow-up. This optimizes for object emission over assembly emission. By removing the `DenseMap` in `MCAssembler`, llc memory usage drops from around 1040 MB to 1001 MB (3.8%). (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@237490 91177308-0d34-0410-b5e6-96231b3b80d8
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