[MinGW] [X86] Pass true for the second parameter to StubValueTy for MO_COFFSTUB. NFC.

These stubs should never be emitted for internal symbols, and
nothing in AsmPrinter ever actually use this value when producing
the stubs for COFF anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341177 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed