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

src/compiler/instruction-selector.h

Index: src/compiler/instruction-selector.h
diff --git a/src/compiler/instruction-selector.h b/src/compiler/instruction-selector.h
index 4e3f546c77d658396012243138a445160d7eca48..6dd0aaf89467f2f41289f6a0f87eff78bed738d2 100644
--- a/src/compiler/instruction-selector.h
+++ b/src/compiler/instruction-selector.h
@@ -72,6 +72,7 @@ class V8_EXPORT_PRIVATE InstructionSelector final {
   void StartBlock(RpoNumber rpo);
   void EndBlock(RpoNumber rpo);
   void AddInstruction(Instruction* instr);
+  void SetSourcePosition(const Instruction* instr, SourcePosition value);
 
   // ===========================================================================
   // ============= Architecture-independent code emission methods. =============
@@ -334,6 +335,8 @@ class V8_EXPORT_PRIVATE InstructionSelector final {
   void VisitCall(Node* call, BasicBlock* handler = nullptr);
   void VisitDeoptimizeIf(Node* node);
   void VisitDeoptimizeUnless(Node* node);
+  void VisitTrapIf(Node* node);
+  void VisitTrapUnless(Node* node);
   void VisitTailCall(Node* call);
   void VisitGoto(BasicBlock* target);
   void VisitBranch(Node* input, BasicBlock* tbranch, BasicBlock* fbranch);