[UpdateTestChecks][llc] Support arm64-apple-darwin (#165092)

Adds `arm64-apple-darwin` support to `asm.py` matching and removes now
invalidated `target-triple-mismatch` test (I dont have another triple
supported by llc but not the autogenerator that make this test useful).

Author: tomershafir

llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/target-triple-mismatch.ll

@@ -570,6 +570,7 @@ def get_run_handler(triple):
         "arm64": (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_RE),
         "arm64e": (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
         "arm64ec": (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_RE),
+        "arm64-apple-darwin": (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
         "arm64-apple-ios": (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
         "arm64-apple-macosx": (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
         "armv7-apple-ios": (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_IOS_RE),