[build] Add nogncheck to includes of gtest_prod.h

Since gtest_prod.h is in a test-only build target, that target cannot be
a dependency of non-test build targets. To prevent gn check errors
warning about, this add "// nogncheck" to any includes.

Bug: v8:7330
Change-Id: I40de6983e30234de2a778780a9ca839aee0bc8ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2712747
Auto-Submit: Dan Elphick <delphick@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72943}

src/execution/isolate-data.h

@@ -13,7 +13,7 @@
 #include "src/execution/thread-local-top.h"
 #include "src/roots/roots.h"
 #include "src/utils/utils.h"
-#include "testing/gtest/include/gtest/gtest_prod.h"
+#include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck
 
 namespace v8 {
 namespace internal {

src/heap/heap.h

@@ -35,7 +35,7 @@
 #include "src/objects/visitors.h"
 #include "src/roots/roots.h"
 #include "src/utils/allocation.h"
-#include "testing/gtest/include/gtest/gtest_prod.h"
+#include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck
 
 namespace v8 {
 

src/objects/shared-function-info.h

@@ -19,7 +19,7 @@
 #include "src/objects/struct.h"
 #include "src/roots/roots.h"
 #include "src/wasm/value-type.h"
-#include "testing/gtest/include/gtest/gtest_prod.h"
+#include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck
 #include "torque-generated/bit-fields.h"
 #include "torque-generated/field-offsets.h"