[turbofan] Fixes CodeAssembler::Word32Shr'r rhs operand type.

BUG=

Review-Url: https://codereview.chromium.org/2425723002
Cr-Commit-Position: refs/heads/master@{#40367}

src/compiler/code-assembler.cc

@@ -216,7 +216,7 @@ Node* CodeAssembler::WordShr(Node* value, int shift) {
 }
 
 Node* CodeAssembler::Word32Shr(Node* value, int shift) {
-  return (shift != 0) ? raw_assembler_->Word32Shr(value, IntPtrConstant(shift))
+  return (shift != 0) ? raw_assembler_->Word32Shr(value, Int32Constant(shift))
                       : value;
 }