[AArch64] Use 0-cycle reg2reg MOVs for FPR32, FPR16, FPR8 (#144152) This change emits optimized copy instructions for FPR32, FPR16, FPR8 register classes on targets that support it. The implementation is similar to what has been done for GPR32. It adds 2 regression tests for FPR32 and FPR16. Depends on: https://github.com/llvm/llvm-project/pull/143680 to resolve the test structure.
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