[gin] Add flag for eliding redundant TDZ checks in Ignition

Bug: v8:13723
Change-Id: I332215c76b5f64514ea5c8e7a9cdccf210839c47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4523612
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1142886}

diff --git a/gin/gin_features.h b/gin/gin_features.h
index 7399e408..e0cc3c4f 100644
--- a/gin/gin_features.h
+++ b/gin/gin_features.h

@@ -25,6 +25,7 @@
 GIN_EXPORT BASE_DECLARE_FEATURE(kV8FlushBaselineCode);
 GIN_EXPORT BASE_DECLARE_FEATURE(kV8FlushBytecode);
 GIN_EXPORT BASE_DECLARE_FEATURE(kV8FlushEmbeddedBlobICache);
+GIN_EXPORT BASE_DECLARE_FEATURE(kV8IgnitionElideRedundantTdzChecks);
 GIN_EXPORT BASE_DECLARE_FEATURE(kV8LazyFeedbackAllocation);
 GIN_EXPORT BASE_DECLARE_FEATURE(kV8Maglev);
 GIN_EXPORT BASE_DECLARE_FEATURE(kV8MinorMC);