[clang] [llvm] [RISCV] Add a generic OOO CPU (PR #120712)

[Min-Yih Hsu via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mca_test_checks.py
+# RUN: llvm-mca -mtriple=riscv64 -mattr=+rva23u64,+zabha -mcpu=generic-ooo --all-stats -iterations=1 < %s | FileCheck %s
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mshockwave wrote:

nit: `--all-stats` shows many MCA internals like PRF and ROB utilization, I'm a little concerned that such info is more volatile and more importantly, is not directly related to scheduling model. Could we just use the default view?

https://github.com/llvm/llvm-project/pull/120712