[llvm-exegesis] Add an analysis mode.

Summary:
The analysis mode gives the user a clustered view of the measurement results.
Next steps are (requires the split ok AsmTemplate.Name into {mnemonic, mode}):
 - Show the sched class.
 - Highlight any inconsistencies with the checked-in data.

Reviewers: gchatelet

Subscribers: mgorny, llvm-commits, tschuett

Differential Revision: https://reviews.llvm.org/D46865

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332344 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed