COFF: Add IMAGE_SCN_MEM_READ to text sections.

There are currently 100 references to COFF::IMAGE_SCN in 6 files
and 11 different functions. Section to attribute mapping really
needs to happen in one place to avoid problems like this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117473 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed