S390: Overflow check assert expanded to include kS390_Add/kS390_Sub

Debug asserts in code-generator-s390.cc are in place to ensure that overflow is only set when dealing with a sub or add opcode. However, the check only looked for kS390_Add/SubWithOverflow32, not kS390_Add/Sub which also sets overflow. This CL adds the second case to this assert check.

R=michael_dawson@ca.ibm.com,jyan@ca.ibm.com,mtbrandyberry@ca.ibm.com,joransiu@ca.ibm.com

BUG=

Review URL: https://codereview.chromium.org/1863983003

Cr-Commit-Position: refs/heads/master@{#35310}

src/compiler/s390/code-generator-s390.cc

@@ -1694,7 +1694,8 @@ void CodeGenerator::AssembleArchBoolean(Instruction* instr,
 
   // Overflow checked for add/sub only.
   DCHECK((condition != kOverflow && condition != kNotOverflow) ||
-         (op == kS390_AddWithOverflow32 || op == kS390_SubWithOverflow32));
+         (op == kS390_AddWithOverflow32 || op == kS390_SubWithOverflow32) ||
+         (op == kS390_Add || op == kS390_Sub));
 
   // Materialize a full 32-bit 1 or 0 value. The result register is always the
   // last output of the instruction.