[Interpreter] Add SetPendingMessage bytecode.

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 cc5b5e782bd0c2c8a8b6270ce89485bf5e6843e5..0a8cbe5181224aeb4b8f17f89928fb426da3eafb 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -272,6 +272,10 @@ class V8_EXPORT_PRIVATE BytecodeArrayBuilder final
 
   BytecodeArrayBuilder& StackCheck(int position);
 
+  // Sets the pending message to the value in the accumulator, and returns the
+  // previous pending message in the accumulator.
+  BytecodeArrayBuilder& SetPendingMessage();
+
   BytecodeArrayBuilder& Throw();
   BytecodeArrayBuilder& ReThrow();
   BytecodeArrayBuilder& Return();