Make MC use Windows COFF on Windows and add tests.

llvm-svn: 109494
diff --git a/llvm/test/Scripts/coff-dump.py.bat b/llvm/test/Scripts/coff-dump.py.bat
new file mode 100644
index 0000000..cc83eba
--- /dev/null
+++ b/llvm/test/Scripts/coff-dump.py.bat
@@ -0,0 +1,4 @@
+@echo off
+
+%PYTHON_EXECUTABLE% %LLVM_SRC_ROOT%\test\Scripts\coff-dump.py %1 %2 %3 %4 %5 %6 %7 %8 %9
+