<type_traits>: Partially unblock P0466R5 for Clang
#5621
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Intrinsics
__is_layout_compatibleand__is_pointer_interconvertible_base_ofare implemented in Clang 19 (LLVM-81506, LLVM-88473), so this PR unblocks the corresponding standard library components for Clang.Unfortunately, according to WG21-P0466R5,
__cpp_lib_is_layout_compatiblecoversis_layout_compatible(_v)and__is_corresponding_member, and__cpp_lib_is_pointer_interconvertiblecoversis_pointer_interconvertible_base_of(_v)andis_pointer_interconvertible_with_class,so no feature-test macro should be unblocked for Clang at this moment.
Also adds workaround for LLVM-135273 and RWC, and specially handles EDG for IntelliSense with LLVM toolset.