Add support for `[[msvc::forceinline]]` and
`[[msvc::forceinline_calls]]`.
`[[msvc::forceinline]]` is equivalent to Microsoft's `__forceinline`
when placed before a function declaration.
Unlike `__forceinline`, `[[msvc::forceinline]]` works with lambdas.
`[[msvc::forceinline_calls]]` is simliar to `[[clang::always_inline]]`
but only works on statements.
Both are implemented as aliases of `[[clang::always_inline]]` with
special checks.
Fixes#186539.
