[llvm] [VPlan] Add WidenGEP::getSourceElementType (NFC) (PR #159029)

[Luke Lau via llvm-commits]

================
@@ -1763,6 +1763,8 @@ struct LLVM_ABI_FOR_TEST VPWidenSelectRecipe : public VPRecipeWithIRFlags,
 
 /// A recipe for handling GEP instructions.
 class LLVM_ABI_FOR_TEST VPWidenGEPRecipe : public VPRecipeWithIRFlags {
+  Type *SourceElementTy;
----------------
lukel97 wrote:

Do we need to store the type? Can we just access it via the underlying instruction instead 

https://github.com/llvm/llvm-project/pull/159029