[llvm] [Exegesis][RISCV] Add RISCV support for llvm-exegesis (PR #89047)

[Keeran Rothenfusser via llvm-commits]

================
@@ -52,7 +52,7 @@ computeAliasingInstructions(const LLVMState &State, const Instruction *Instr,
       continue;
     if (OtherOpcode == Instr->Description.getOpcode())
       continue;
-    if (!State.getExegesisTarget().checkOpcodeSupported(
+    if (State.getExegesisTarget().checkOpcodeSupported(
----------------
keeranroth wrote:

Was correct before

https://github.com/llvm/llvm-project/pull/89047