Remove AArch64::AEK_FP16ML from Arm Cortex-A78C definition, as this is not supported, according to the Technical Reference Manual: https://developer.arm.com/documentation/102226/latest/ Also add AArch64::AEK_FLAGM (Flag Manipulation) to Arm Cortex-X1C and Arm Cortex-X2 as these were missing previously, but are supported, according to the Technical Reference Manuals: https://developer.arm.com/documentation/101968/latest/ https://developer.arm.com/documentation/101803/latest/ Fixes #62383