[llvm] [RISCV][GISel] Legalize G_{U|S}{ADD|SUB}SAT (PR #92935)

[Craig Topper via llvm-commits]

================
@@ -361,6 +361,10 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &ST)
 
   getActionDefinitionsBuilder(G_DYN_STACKALLOC).lower();
 
+  // TODO: Use Vector Single-Width Saturating Instructions for vector types.
+  getActionDefinitionsBuilder({G_UADDSAT, G_SADDSAT, G_USUBSAT, G_SSUBSAT})
----------------
topperc wrote:

Maybe put this closer to the legalization rules fro ADD and ADDO?

https://github.com/llvm/llvm-project/pull/92935