[MCA] Fix llvm-mca to skip input reading when -mcpu=help is specified (#174421) llvm-mca currently attempts to read the input file (or stdin) even when invoked with -mcpu=help. When the input is stdin, this causes the tool to block unless an empty stdin is provided. This patch now allows the available CPUs/features to be printed without requiring stdin, while existing behaviour for all other invocations still requires stdin. - mcpu-help.test has been added Follow-on from reverted https://github.com/llvm/llvm-project/pull/173399. Implements @mshockwave's suggestion.
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