aarch64: remove x30 -> lr translation in inline assembly clobbers

[lalinsky]

Codegen currently has this code:

rust/compiler/rustc_codegen_llvm/src/asm.rs

Lines 487 to 490 in 21cbbdc

	} else if reg == InlineAsmReg::AArch64(AArch64InlineAsmReg::x30) {
	// LLVM doesn't recognize x30
	"{lr}".to_string()
	} else {

I hit the same issue in Zig and decided to fix it properly in LLVM, so when the fix gets released, this will no longer be needed:

llvm/llvm-project#167783