Merge MCSymbol and MCSymbolData.

As a transition hack leave MCSymbolData as a typedef of MCSymbol. I will be
removing that in a second.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238609 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed