[MC][COFF] Delay handling symbol aliases when writing

Fixes PR14447 and PR9034. Patch by Nico Rieck!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173839 91177308-0d34-0410-b5e6-96231b3b80d8
Made certain small functions in PtrState inlined.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173842 91177308-0d34-0410-b5e6-96231b3b80d8