[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..f46c786d6beeedd7e07b4bf0a3c248d1bb966756 100644
--- a/src/compiler/instruction-selector.h
+++ b/src/compiler/instruction-selector.h
@@ -334,6 +334,8 @@ 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);
@@ -364,6 +366,7 @@ class V8_EXPORT_PRIVATE InstructionSelector final {
   bool instruction_selection_failed() { return instruction_selection_failed_; }
 
   void MarkPairProjectionsAsWord32(Node* node);
+  bool IsSourcePositionUsed(Node* node);
 
   // ===========================================================================