[llvm-mca][View] Improved Retire Control Unit Statistics.
RetireControlUnitStatistics now reports extra information about the ROB and the
avg/maximum number of entries consumed over the entire simulation.
Retire Control Unit - number of cycles where we saw N instructions retired: [# retired], [# cycles] 0, 109 (17.9%) 1, 102 (16.7%) 2, 399 (65.4%) Total ROB Entries: 64 Max Used ROB Entries: 35 ( 54.7% ) Average Used ROB Entries per cy: 32 ( 50.0% )
Documentation in llvm/docs/CommandGuide/llvmn-mca.rst has been updated to
reflect this change.