[jumbo] undef more instances of __ after use

Bug: chromium:746958
Change-Id: I38e19678e57e5769f4eb19b588ab1de1f4c3bb11
Reviewed-on: https://chromium-review.googlesource.com/758777Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#49252}

src/debug/arm64/debug-arm64.cc

@@ -57,4 +57,6 @@ const bool LiveEdit::kFrameDropperSupported = true;
 }  // namespace internal
 }  // namespace v8
 
+#undef __
+
 #endif  // V8_TARGET_ARCH_ARM64

src/regexp/arm64/regexp-macro-assembler-arm64.cc

@@ -1655,4 +1655,6 @@ void RegExpMacroAssemblerARM64::LoadCurrentCharacterUnchecked(int cp_offset,
 }  // namespace internal
 }  // namespace v8
 
+#undef __
+
 #endif  // V8_TARGET_ARCH_ARM64

test/cctest/heap/test-heap.cc

@@ -5999,3 +5999,5 @@ HEAP_TEST(Regress779503) {
 }  // namespace heap
 }  // namespace internal
 }  // namespace v8
+
+#undef __

test/cctest/test-utils-arm64.cc

@@ -451,3 +451,5 @@ void RegisterDump::Dump(MacroAssembler* masm) {
 
 }  // namespace internal
 }  // namespace v8
+
+#undef __