[compiler-rt] [lldb] [flang] [libc] [libcxxabi] [llvm] [lld] [libcxx] [clang] [libclc] [clang-tools-extra] [VPlan] Add new VPScalarCastRecipe, use for IV & step trunc. (PR #78113)

[Florian Hahn via cfe-commits]

================
@@ -230,7 +230,11 @@ Type *VPTypeAnalysis::inferScalarType(const VPValue *V) {
             return V->getUnderlyingValue()->getType();
           })
           .Case<VPWidenCastRecipe>(
-              [](const VPWidenCastRecipe *R) { return R->getResultType(); });
+              [](const VPWidenCastRecipe *R) { return R->getResultType(); })
+          .Case<VPExpandSCEVRecipe>([](const VPExpandSCEVRecipe *R) {
----------------
fhahn wrote:

VPDerivedIVRecipe getScalarType would be good to remove, will do as follow-up.

`VPWidenIntOrFpInductionRecipe's` trunc drives truncating the start value and 
step, effectively creating a narrow phi. I'll check to see if this can also be 
modeled with the new recipe.

https://github.com/llvm/llvm-project/pull/78113
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