Bump expected static initializers count from 2 to 3

This should also unblock V8 DEPS roll:
https://chromium-review.googlesource.com/c/v8/v8/+/2689808

Bug: chromium:1177324
Change-Id: Iede2ba9c2257a2996715bcb7821ce14baa9ae9a8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2689089Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72687}

tools/check-static-initializers.sh

@@ -30,9 +30,12 @@
 # initializer in d8 matches the one defined below.
 
 # Allow:
-# _GLOBAL__sub_I_d8.cc
+# _GLOBAL__I_000101
 # _GLOBAL__sub_I_iostream.cpp
-expected_static_init_count=2
+# _GLOBAL__sub_I_d8.cc
+# The first two are needed to set up std::cin/cout/cerr before main() runs.
+# See https://crbug.com/1177324 for more.
+expected_static_init_count=3
 
 v8_root=$(readlink -f $(dirname $BASH_SOURCE)/../)