[clang] [Clang][AArch64] Add mfloat8_t variants of Neon load intrinsics (PR #145666)

[via cfe-commits]

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+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
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CarolineConcatto wrote:

I believe we could add the tests in this file to the already existing files for neon loads: clang/test/CodeGen/AArch64/neon-intrinsics.c
The mfloat8 is not guarded by fp8 feature.

https://github.com/llvm/llvm-project/pull/145666