Add Compiler Condition to use inline assembly optimizations with ARM64 for Compatibility with MSVC

[dsmith111]

#17665

Problem
google\protobuf\parse_context.h(721,10): error C2059: syntax error: ':'
google\protobuf\parse_context.h(898,14): error C3861: 'Ubfx7': identifier not found

The latest protobuf versions fail to compile with MSVC on Windows ARM64 architecture.

Inline assembly is only available for x86 targets. For similar functionality in x64 or ARM64 code, use compiler intrinsics.

https://learn.microsoft.com/en-us/cpp/assembler/inline/writing-functions-with-inline-assembly?view=msvc-170

Solution
As inline assembly for win ARM64 with MSVC as a compiler is not supported (even ARM specific assembly functions), a term has been added to the conditions in parse_context.h to prevent the assembly optimizations for arm64 from executing if the compiler is MSVC.

Tested by compiling protobuf with MSVC on Windows ARM64 and AMD64 architecture. Compilation was a success.

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[dsmith111]

Hey @fowles, just a habit when contributing to open-source (I know teams change), want to check in and make sure you're still an active maintainer here! @acozzette, adding the other majority git-blame owner as well.