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5443644017
Add support in llvm-readobj for displaying them and support in the asm parsser, AArch64TargetStreamer and MCWin64EH for emitting them. The directives for the remaining basic opcodes have names that match the opcode in the documentation. The directives for custom stack cases, that are named MSFT_OP_TRAP_FRAME, MSFT_OP_MACHINE_FRAME, MSFT_OP_CONTEXT and MSFT_OP_CLEAR_UNWOUND_TO_CALL, are given matching assembler directive names that fit into the rest of the opcode naming; .seh_trap_frame, .seh_context, .seh_clear_unwound_to_call The opcode MSFT_OP_MACHINE_FRAME is mapped to the existing opecode enum UOP_PushMachFrame that is used on x86_64, and also uses the corresponding existing x86_64 directive name .seh_pushframe. Differential Revision: https://reviews.llvm.org/D86889