[llvm] [RISCV] Add short forward branch support for `min`, `max`, `maxu` and `minu` (PR #164394)

[Sam Elliott via llvm-commits]

================
@@ -1850,6 +1850,10 @@ def TuneShortForwardBranchOpt
 def HasShortForwardBranchOpt : Predicate<"Subtarget->hasShortForwardBranchOpt()">;
 def NoShortForwardBranchOpt : Predicate<"!Subtarget->hasShortForwardBranchOpt()">;
 
+def TuneShortForwardBranchIMinMax
+    : SubtargetFeature<"short-forward-branch-i-minmax", "HasShortForwardBranchIMinMax",
+                       "true", "Enable short forward branch optimization for min,max instructions in Zbb", [TuneShortForwardBranchOpt]>;
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lenary wrote:

This line is getting quite long. 
```suggestion
                       "true", "Enable short forward branch optimization for min,max instructions in Zbb",
                       [TuneShortForwardBranchOpt]>;
```

https://github.com/llvm/llvm-project/pull/164394