llvm/test/DebugInfo/X86/gmlt.test: Get rid of %llc_dwarf. It should not be used with -mtriple.

Also, remove object-emission. test/DebugInfo/X86 doesn't require it.
llvm-cov/CoverageReport.cpp: Quick fix for msvcrt, since width specifier "z" is unavailable.

Note, mingw uses its own printf instead of msvcrt.