Speculative Windows build fix.

Try to dllimport the dllexported global object HashTable.

* jsc.cpp:
* testRegExp.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171843 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Speculative Windows build fixery, part II.

This seems to indicate that adding the globalObjectTable to the exports file
was the wrong idea:

1>WebKit.exp : error LNK2001: unresolved external symbol "struct JSC::HashTable const JSC::globalObjectTable" (?globalObjectTable@JSC@@3UHashTable@1@B)

* WebKit.vcxproj/WebKitExportGenerator/WebKitExports.def.in:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171844 268f45cc-cd09-0410-ab3c-d52691b4dbfc