aarch64: Support FEAT_LSFE #201
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Armv9.6 added atomic float instructions for binary{16,32,64} and bfloat16 as FEAT_LSFE (Large System Float Extension).
This PR optimizes AArch64 {16,32,64}-bit atomic float add/sub/max/min when FEAT_LSFE is enabled.
LLVM's assembly support for FEAT_LSFE needs LLVM 20 (llvm/llvm-project@67ff5ba), so use .inst directive on LLVM 19 or older.
Run-time detection is also implemented, but at this time it is only used in testing. AFAIK no CPUs actually implement this feature yet, so we will only refer to the feature available at compile time at this time.