[Bitcode] Check for missing load type

We perform do this check independently of whether this is an old
or new style load.

Fixes #74556.

Author: nikic

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -5968,10 +5968,11 @@ Error BitcodeReader::parseFunctionBody(Function *F) {
       } else {
         ResTypeID = getContainedTypeID(OpTypeID);
         Ty = getTypeByID(ResTypeID);
-        if (!Ty)
-          return error("Missing element type for old-style load");
       }
 
+      if (!Ty)
+        return error("Missing load type");
+
       if (Error Err = typeCheckLoadStoreInst(Ty, Op->getType()))
         return Err;
 
@@ -6006,10 +6007,11 @@ Error BitcodeReader::parseFunctionBody(Function *F) {
       } else {
         ResTypeID = getContainedTypeID(OpTypeID);
         Ty = getTypeByID(ResTypeID);
-        if (!Ty)
-          return error("Missing element type for old style atomic load");
       }
 
+      if (!Ty)
+        return error("Missing atomic load type");
+
       if (Error Err = typeCheckLoadStoreInst(Ty, Op->getType()))
         return Err;