Implement P2674R1 `is_implicit_lifetime` for MSVC and EDG

[StephanTLavavej]

Followup to #3445.

#5445 is implementing WG21-P2674R1 is_implicit_lifetime for Clang 20. When the necessary builtin becomes available for MSVC and EDG, we should extend the implementation accordingly. I've filed:

• VSO-2581622 C1XX should implement __builtin_is_implicit_lifetime
  • Implemented by MSVC-PR-675420 for MSVC Compiler 19.51 Preview 1.
• VSO-2581623 EDG should implement __builtin_is_implicit_lifetime