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4652459f64
Finally remove the `MCSymbolData::Symbol` pointer. It was still being used to track whether `MCSymbolData` had been initialized, but this is better tracked by the bitfield in `MCSymbol`. The only caller of `MCSymbolData::initialize()` was `MCAssembler`, which (other than `Symbol`) passed in all-0 values. Replace all that indirection with a default constructor. The main point is a cleanup (and there's more cleanup to do), but there are also some small memory savings. I measured ~989 MB down to ~975 MB, cutting a little over 1% off the top of `llc`. (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@237873 91177308-0d34-0410-b5e6-96231b3b80d8