ARM: Support SingleParameterDotFile on WoA

Currently, the integrated assembler is the only choice for assembling Windows on
ARM binaries.  IAS supports the .file <filename> directive which emits the file
symbol into the resulting object binary.  Mark the GNU COFF information to
indicate support for this feature.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207341 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed