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[clang][x86] Add release note entries describing recent work to making SSE intrinsics generic and usable with constexpr (#154737)

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I haven't created an exhaustive list of intrinsic changes, but I suppose I could if people see a strong need for it.
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clang/docs/ReleaseNotes.rst
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@ -309,6 +309,13 @@ NVPTX Support
X86 Support
^^^^^^^^^^^
- More SSE, AVX and AVX512 intrinsics, including initializers and general
arithmetic can now be used in C++ constant expressions.
- Some SSE, AVX and AVX512 intrinsics have been converted to wrap
generic __builtin intrinsics.
- NOTE: Please avoid use of the __builtin_ia32_* intrinsics - these are not
guaranteed to exist in future releases, or match behaviour with previous
releases of clang or other compilers.
Arm and AArch64 Support
^^^^^^^^^^^^^^^^^^^^^^^