Introduce bytecodes for assisting generator suspend and resume.

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index 4ad9ff995a1ce74bb3ed34928fba90180048d3fe..dfb3e8d4ff87e24371cc12a69c369f821551a39f 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -243,6 +243,10 @@ class BytecodeArrayBuilder final : public ZoneObject {
                                   int feedback_slot);
   BytecodeArrayBuilder& ForInStep(Register index);
 
+  // Generators.
+  BytecodeArrayBuilder& SuspendGenerator(Register generator);
+  BytecodeArrayBuilder& ResumeGenerator(Register generator);
+
   // Exception handling.
   BytecodeArrayBuilder& MarkHandler(int handler_id, bool will_catch);
   BytecodeArrayBuilder& MarkTryBegin(int handler_id, Register context);