[IR] Remove zext and sext constant expressions (#71040)

Remove support for zext and sext constant expressions. All places
creating them have been removed beforehand, so this just removes the
APIs and uses of these constant expressions in tests.

There is some additional cleanup that can be done on top of this, e.g.
we can remove the ZExtInst vs ZExtOperator footgun.

This is part of
https://discourse.llvm.org/t/rfc-remove-most-constant-expressions/63179.

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 747968b..1c92da5a 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1394,6 +1394,9 @@ static bool isConstExprSupported(const BitcodeConstant *BC) {
   if (Instruction::isBinaryOp(Opcode))
     return ConstantExpr::isSupportedBinOp(Opcode);
 
+  if (Instruction::isCast(Opcode))
+    return ConstantExpr::isSupportedCastOp(Opcode);
+
   if (Opcode == Instruction::GetElementPtr)
     return ConstantExpr::isSupportedGetElementPtr(BC->SrcElemTy);