Remove unused EXPORT_SYMBOL_FLAGS_STATIC_RESOLVER.

https://bugs.webkit.org/show_bug.cgi?id=326386
rdar://189195350

Reviewed by Yijia Huang.

EXPORT_SYMBOL_FLAGS_STATIC_RESOLVER was never used.

No new tests needed.  Just removing dead code.

* Source/JavaScriptCore/corpse/CorpseExportsTrie.cpp:
* Source/JavaScriptCore/corpse/tests/CorpseExportsTrieTest.cpp:
(JSCToolsTest::testFoundExports):

Canonical link: https://commits.webkit.org/322752@main