[llvm] [llvm][CodeGen] Added a check in CodeGenPrepare::optimizeSwitchType (PR #83322)

[Philip Reames via llvm-commits]

================
@@ -7397,7 +7397,19 @@ bool CodeGenPrepare::optimizeSwitchType(SwitchInst *SI) {
     if (Arg->hasZExtAttr())
       ExtType = Instruction::ZExt;
   }
-
+  // If Cond has 2 users and one of them is a sext don't use a zext.
----------------
preames wrote:

We should probably be looking at the other user and using it's extend kind (sign or zero).

we probably do want the argument extend kind check to overrule, so maybe put this just above?

https://github.com/llvm/llvm-project/pull/83322