[PATCH] Add checks for MSVC in LLVM_FALLTHROUGH and LLVM_NODISCARD

[Thad House via llvm-commits]

MSVC defaults __cplusplus to an old version, which causes the preprocessor
to fallthrough to the clang::xx attribute checks. MSVC see's these and
errors intellisense. This checks for MSVC explicitly, and handles the
attributes for it separately.
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