[llvm] [MC] Add -reservation-station-scale-factor option (PR #195638)

[Tomer Shafir via llvm-commits]

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tomershafir wrote:

I do not see a substantial compile-time regression on CTMark:
https://llvm-compile-time-tracker.com/compare.php?from=72a3cd9e54f16d87f47bc984672999a9b67cd4f4&to=0ccf47066acd23fa17d53bc1fc8ad2c4d51156e9&stat=instructions%3Au#

https://github.com/llvm/llvm-project/pull/195638