[llvm] [RISC-V] Pool duplicate scheduling class descriptors (PR #202659)

[Craig Topper via llvm-commits]

================
@@ -152,6 +152,12 @@ struct MCSchedClassDesc {
   }
 };
 
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
----------------
topperc wrote:

Can you write that in a comment in the code?

https://github.com/llvm/llvm-project/pull/202659