[clang] [llvm] LLVM] Add `__builtin_readfixedtimer` intrinsic and buiiltin for realtime clocks (PR #81331)

[Fangrui Song via cfe-commits]

MaskRay wrote:

Looks good.

> LLVM] Add

Missing `[`?

https://github.com/llvm/llvm-project/pull/81331
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