[gcov] Fix build

Change-Id: I244a28e29f14b05a50c8bb10db429b16b2052aca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2944432Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74976}

src/bigint/bigint-internal.h

@@ -5,6 +5,8 @@
 #ifndef V8_BIGINT_BIGINT_INTERNAL_H_
 #define V8_BIGINT_BIGINT_INTERNAL_H_
 
+#include <memory>
+
 #include "src/bigint/bigint.h"
 
 namespace v8 {