[interpreter] Remove BytecodeArrayBuilder::Illegal().

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 c82e05fcac07aba3c4387f77cfce3ec0fac87a33..3930a06e1b6f64e60bd6718916a5ccb152195f93 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -232,8 +232,6 @@ class BytecodeArrayBuilder final : public ZoneObject {
   BytecodeArrayBuilder& ReThrow();
   BytecodeArrayBuilder& Return();
 
-  BytecodeArrayBuilder& Illegal();
-
   // Debugger.
   BytecodeArrayBuilder& Debugger();
 
@@ -334,6 +332,11 @@ class BytecodeArrayBuilder final : public ZoneObject {
   // Gets a constant pool entry for the |object|.
   size_t GetConstantPoolEntry(Handle<Object> object);
 
+  // Not implemented as the illegal bytecode is used inside internally
+  // to indicate a bytecode field is not valid or an error has occured
+  // during bytecode generation.
+  BytecodeArrayBuilder& Illegal();
+
   Isolate* isolate() const { return isolate_; }
   BytecodeArrayWriter* bytecode_array_writer() {
     return &bytecode_array_writer_;