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

src/compiler/code-generator.h

Index: src/compiler/code-generator.h
diff --git a/src/compiler/code-generator.h b/src/compiler/code-generator.h
index 1c45a48b5063ff3ec984ccbdd1ef6b4f2eab037a..d53a0b9877baf7e6fddac953b681996db6d840a7 100644
--- a/src/compiler/code-generator.h
+++ b/src/compiler/code-generator.h
@@ -70,6 +70,8 @@ class CodeGenerator final : public GapResolver::Assembler {
 
   void AddProtectedInstruction(int instr_offset, int landing_offset);
 
+  void AssembleSourcePosition(Instruction* instr);
+
  private:
   MacroAssembler* masm() { return &masm_; }
   GapResolver* resolver() { return &resolver_; }
@@ -105,7 +107,6 @@ class CodeGenerator final : public GapResolver::Assembler {
   // Assemble code for the specified instruction.
   CodeGenResult AssembleInstruction(Instruction* instr,
                                     const InstructionBlock* block);
-  void AssembleSourcePosition(Instruction* instr);
   void AssembleGaps(Instruction* instr);
 
   // Returns true if a instruction is a tail call that needs to adjust the stack
@@ -121,6 +122,7 @@ class CodeGenerator final : public GapResolver::Assembler {
   void AssembleArchJump(RpoNumber target);
   void AssembleArchBranch(Instruction* instr, BranchInfo* branch);
   void AssembleArchBoolean(Instruction* instr, FlagsCondition condition);
+  void AssembleArchTrap(Instruction* instr, FlagsCondition condition);
   void AssembleArchLookupSwitch(Instruction* instr);
   void AssembleArchTableSwitch(Instruction* instr);