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Followup to #99570. * `TEST_COMPILER_MSVC` must be tested for `defined`ness, as it is everywhere else. + Definition:52a7116f5c/libcxx/test/support/test_macros.h (L71-L72)+ Example usage:52a7116f5c/libcxx/test/std/utilities/function.objects/func.not_fn/not_fn.pass.cpp (L248)+ Fixes: `llvm-project\libcxx\test\support\atomic_helpers.h(33): fatal error C1017: invalid integer constant expression` * Fix bogus return type: `msvc_is_lock_free_macro_value()` returns `2` or `0`, so it needs to return `int`. + Fixes: `llvm-project\libcxx\test\support\atomic_helpers.h(41): warning C4305: 'return': truncation from 'int' to 'bool'` * Clarity improvement: also add parens when mixing bitwise with arithmetic operators.