MC: Teach the COFF object writer to write address-significance tables.

The format is the same as in ELF: a sequence of ULEB128-encoded
symbol indexes.

Differential Revision: https://reviews.llvm.org/D51047

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340499 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed