[llvm] [RISCV][GISEL] Legalize, regbank select, and instruction select G_ZEXT, G_SEXT, G_ANYEXT, G_SPLAT_VECTOR, and G_ICMP (PR #85938)

[Matt Arsenault via llvm-commits]

================
@@ -229,6 +236,9 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &ST)
 
   getActionDefinitionsBuilder(G_ICMP)
       .legalFor({{sXLen, sXLen}, {sXLen, p0}})
+      .widenScalarOrEltToNextPow2OrMinSize(1, 8)
+      .legalIf(all(typeIsLegalBoolVec(0, BoolVecTys, ST),
----------------
arsenm wrote:

legal operations should be preferred as the first action

https://github.com/llvm/llvm-project/pull/85938