[llvm-exegesis][NFC] Add a way to declare the default counter binding for unbound CPUs for a target.
Summary:
This simplifies the code and moves everything to tablegen for consistency. This
also prepares the ground for adding issue counters.
Reviewers: gchatelet, john.brawn, jsji
Subscribers: nemanjai, mgorny, javed.absar, kbarton, tschuett, llvm-commits
Differential Revision: https://reviews.llvm.org/D54297
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346489
91177308-0d34-0410-b5e6-
96231b3b80d8
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