[Development] MSVC not inlining QRect inline functions (anymore?)

[Tim Blechmann]

>> clang-cl functions as drop-in replacement for msvc that would deliver
>> superior codegen without the need to migrate to another runtime library.
>> but unfortunately clang-cl is still not supported by qt (neither
>> officially, nor with CI build tests).
> 
> We've been waiting for clang-cl to be 100% compatible with either Clang or cl.
> A third one is too much maintenance.

how realistic is it to be 100% compatible? afaict clang-cl tries to meet 
the sweet spot of behaving like cl, just as clang tries to behave like 
gcc (e.g. both identifying as the compiler that it is and as compiler 
that it tries to identify as).

from my experience, supporting clang-cl in a codebase that supports both 
mingw and msvc build, tends to be minimal effort. while being able to 
provide binaries that are compatible with msvc runtime and have better 
codegen tends to be low-effort/high-reward.