[gcc] Suppress array bounds warning

Suppress a gcc array bounds warning in ComputeStackLimit, where we are
very intentionally accessing a location out of bounds.

Bug: chromium:1307180
Change-Id: If4b7ce182472a761f9f619824676e5e660b0277a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3732109
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81416}

test/cctest/test-api.cc

@@ -16564,7 +16564,12 @@ static void GetStackLimitCallback(
 // Given a size, returns an address that is that far from the current
 // top of stack.
 static uint32_t* ComputeStackLimit(uint32_t size) {
+  // Disable the gcc error which (very correctly) notes that this is an
+  // out-of-bounds access.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
   uint32_t* answer = &size - (size / sizeof(size));
+#pragma GCC diagnostic pop
   // If the size is very large and the stack is very near the bottom of
   // memory then the calculation above may wrap around and give an address
   // that is above the (downwards-growing) stack.  In that case we return