[wasm] Introduce the TrapIf and TrapUnless operators to generate trap code.

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

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 2117 matching lines @@
     }
   }
   __ b(cond, tlabel);
   if (!branch->fallthru) __ b(flabel);  // no fallthru to flabel.
 }
 
 void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ b(GetLabel(target));
 }
 
+void CodeGenerator::AssembleArchTrap(Instruction* instr,
+                                     FlagsCondition condition) {
+  UNREACHABLE();
+}
+
 // Assembles boolean materializations after an instruction.
 void CodeGenerator::AssembleArchBoolean(Instruction* instr,
                                         FlagsCondition condition) {
   S390OperandConverter i(this, instr);
   ArchOpcode op = instr->arch_opcode();
   bool check_unordered = (op == kS390_CmpDouble || op == kS390_CmpFloat);
 
   // Overflow checked for add/sub only.
   DCHECK((condition != kOverflow && condition != kNotOverflow) ||
          (op == kS390_Add32 || kS390_Add64 || op == kS390_Sub32 ||
@@ skipping 412 matching lines @@
       padding_size -= 2;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8