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If EAF+ is enabled for firefox.exe, the process does not launch because we parse the PE headers of ntdll.dll at startup, which is prohibited by EAF+. With this patch, we skip two operations when EAF+ is enabled. The first one is to cache ntdll's IAT at startup. Because EAF+ is expected to prevent an injected module from parsing PE headers and modifying IAT, we can skip this caching safely. The second one is to load ntdll's debug information for the profiler. With this patch, the profiler's callstack will not show a raw address instead of a symbol name. It's a bad side effect, but much better than startup crash. Differential Revision: https://phabricator.services.mozilla.com/D76959