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

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index f204bb849e4045acef928a2068130f5572112cd4..00330cd7603d421f83767a33ebaa5ace4164129c 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -127,6 +127,10 @@ void InstructionSelector::AddInstruction(Instruction* instr) {
   }
 }
 
+void InstructionSelector::SetSourcePosition(const Instruction* instr,
+                                            SourcePosition value) {
+  sequence()->SetSourcePosition(instr, value);
+}
 
 Instruction* InstructionSelector::Emit(InstructionCode opcode,
                                        InstructionOperand output,
@@ -838,8 +842,7 @@ void InstructionSelector::VisitBlock(BasicBlock* block) {
     if (source_position.IsKnown() &&
         (source_position_mode_ == kAllSourcePositions ||
          node->opcode() == IrOpcode::kCall)) {
-      sequence()->SetSourcePosition(instructions_[current_node_end],
-                                    source_position);
+      SetSourcePosition(instructions_[current_node_end], source_position);
     }
   }
 
@@ -1011,6 +1014,10 @@ void InstructionSelector::VisitNode(Node* node) {
       return VisitDeoptimizeIf(node);
     case IrOpcode::kDeoptimizeUnless:
       return VisitDeoptimizeUnless(node);
+    case IrOpcode::kTrapIf:
+      return VisitTrapIf(node);
+    case IrOpcode::kTrapUnless:
+      return VisitTrapUnless(node);
     case IrOpcode::kFrameState:
     case IrOpcode::kStateValues:
     case IrOpcode::kObjectState: