[MSVC] __FUNCTION__ Macro Expansion Difference.

[gmh5225]

LLVM-MSVC expands FUNCTION to FILE(Line:LINE)

#define FDPrint(Format, ...) DbgPrintEx(DPFLTR_IHVDRIVER_ID, DPFLTR_ERROR_LEVEL, "%s: "##Format, __FUNCTION__ __VA_OPT__(,) __VA_ARGS__)