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

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

 // Copyright 2014 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/arm/macro-assembler-arm.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 14 matching lines @@
 class ArmOperandConverter final : public InstructionOperandConverter {
  public:
   ArmOperandConverter(CodeGenerator* gen, Instruction* instr)
       : InstructionOperandConverter(gen, instr) {}
 
   SBit OutputSBit() const {
     switch (instr_->flags_mode()) {
       case kFlags_branch:
       case kFlags_deoptimize:
       case kFlags_set:
+      case kFlags_trap:
         return SetCC;
       case kFlags_none:
         return LeaveCC;
     }
     UNREACHABLE();
     return LeaveCC;
   }
 
   Operand InputImmediate(size_t index) {
     Constant constant = ToConstant(instr_->InputAt(index));
@@ skipping 1538 matching lines @@
   Condition cc = FlagsConditionToCondition(branch->condition);
   __ b(cc, 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) {
   ArmOperandConverter i(this, instr);
 
   // Materialize a full 32-bit 1 or 0 value. The result register is always the
   // last output of the instruction.
   DCHECK_NE(0u, instr->OutputCount());
   Register reg = i.OutputRegister(instr->OutputCount() - 1);
@@ skipping 500 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8