[interpreter, debugger] implement debugger statement.

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 a61a1c3fce29dd15dc6f8cbb50786d2302e616ae..3cb7945adc973ae2380cac67d54d4e2af8255798 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -242,6 +242,9 @@ class BytecodeArrayBuilder final : public ZoneObject, private RegisterMover {
   BytecodeArrayBuilder& ReThrow();
   BytecodeArrayBuilder& Return();
 
+  // Debugger.
+  BytecodeArrayBuilder& Debugger();
+
   // Complex flow control.
   BytecodeArrayBuilder& ForInPrepare(Register cache_info_triple);
   BytecodeArrayBuilder& ForInDone(Register index, Register cache_length);