Toolset update: VS 2022 17.0 Preview 2#2064

Merged

StephanTLavavej merged 30 commits intomicrosoft:mainfrom

StephanTLavavej:vs-2022-17.0-preview-2

Jul 20, 2021

Commits on Jul 15, 2021

Commits on Jul 17, 2021

Activate constexpr dynamic alloc for Clang.
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Remove unnecessary feature-test macro tests.
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In C++20/23 code, change _CONSTEXPR20_DYNALLOC/_CONSTEXPR20_CONTAINER to constexpr.
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Replace all _CONSTEXPR20_DYNALLOC/_CONSTEXPR20_CONTAINER with _CONSTEXPR20, no manual changes.
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Remove TRANSITION, LLVM-49342 comments - we want NRVO friendliness.
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Cleanup: Change `return X op= Y;` to `X op= Y; return X;` for NRVO.
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Cleanup: Manual changes for NRVO.
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Remove workaround for Clang 11 targeting ARM64.
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Remove VSO-752709 workaround, but filed 2 new bugs.
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README updates.
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Silence Clang 12 error: unused variable 'citer' [-Werror,-Wunused-variable].
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`#ifdef __cpp_lib_constexpr_dynamic_alloc` => `#if _HAS_CXX20`
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`#ifdef __cpp_lib_constexpr_string` => `#if _HAS_CXX20`
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`#ifdef __cpp_lib_destroying_delete` => `#if _HAS_CXX20`
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`#ifdef __cpp_lib_is_constant_evaluated` => `#if _HAS_CXX20`
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`#ifdef __cpp_lib_variant` => `#if _HAS_CXX17`
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