In MSVC 2019 __LINE__ is treated as a long, and will now error (C2397) if the literal is narrowed to the initializer type. Lots of people moaning that there's no way to disable this or treat it as a warning.

Another attempt at working around variadic macro bugs in MSVC. Previously, none of the RR_WATCH or RR_LOG macros would compile if used. They now work.

Change-Id: I05312df1d88167d44f2582eb6eb45a0085d09434
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33212Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>