Add %GetUndetectable() test intrinsic and add tests for undetectables.

src/runtime/runtime.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 563 matching lines @@
   F(DeoptimizeFunction, 1, 1)                 \
   F(DeoptimizeNow, 0, 1)                      \
   F(RunningInSimulator, 0, 1)                 \
   F(IsConcurrentRecompilationSupported, 0, 1) \
   F(OptimizeFunctionOnNextCall, -1, 1)        \
   F(OptimizeOsr, -1, 1)                       \
   F(NeverOptimizeFunction, 1, 1)              \
   F(GetOptimizationStatus, -1, 1)             \
   F(UnblockConcurrentRecompilation, 0, 1)     \
   F(GetOptimizationCount, 1, 1)               \
+  F(GetUndetectable, 0, 1)                    \
   F(ClearFunctionTypeFeedback, 1, 1)          \
   F(NotifyContextDisposed, 0, 1)              \
   F(SetAllocationTimeout, -1 /* 2 || 3 */, 1) \
   F(DebugPrint, 1, 1)                         \
   F(DebugTrace, 0, 1)                         \
   F(GlobalPrint, 1, 1)                        \
   F(SystemBreak, 0, 1)                        \
   F(SetFlags, 1, 1)                           \
   F(Abort, 1, 1)                              \
   F(AbortJS, 1, 1)                            \
@@ skipping 271 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_