[llvm] [RISCV] Add UnsupportedSchedZfhExceptForZfhmin for processors only support Zfhmin (PR #120196)

[Craig Topper via llvm-commits]

================
@@ -257,6 +257,31 @@ def : ReadAdvance<ReadFSqrt16, 0>;
 } // Unsupported = true
 }
 
+multiclass UnsupportedSchedZfhExceptForZfhmin {
----------------
topperc wrote:

We don't really like adding unused things to the repo. It's likely to get deleted because it doesn't look used.

https://github.com/llvm/llvm-project/pull/120196