[llvm-exegesis] Print generated assembly snippet (#142540) Debug generated disassembly by passing argument `debug-only="print-gen-assembly"` or `debug-only=preview-gen-assembly` of exegesis call. `--debug-only="print-gen-assembly"` debugs the whole generated assembly snippet . `--debug-only=preview-gen-assembly` debugs the initial 10 instructions and ending 3 lines. Thus, We can in glance see the initial setup code like registers setup and instruction followed by truncated middle and finally print out the last 3 instructions. This helps us look into assembly that exegesis is execution in hardware, Thus, it is simply functionally alias to separate objdump command on the dumped object file.
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