[X86] Improve pfm counter coverage for llvm-exegesis
This patch attempts to improve pfm perf counter coverage for all the x86 CPUs that libpfm4 supports.
Intel/AMD CPU families tend to share names for cycle/uops counters so even if they don't have a scheduler model yet they can at least use the default values (checked against the libpfm4 source code).
The remaining CPUs (where their port/pipe resource counters are known) I've tried to add to the existing model mappings.
These are untested but don't represent a regression to current llvm-exegesis behaviour for these CPUs.
Differential Revision: https://reviews.llvm.org/D55432
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348617
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