REGRESSION(r149165): It made many tests crash on 32 bit
https://bugs.webkit.org/show_bug.cgi?id=115227

Reviewed by Csaba Osztrogonác.

m_reservation is uninitialized when ENABLE(SUPER_REGION) is false.

* heap/SuperRegion.cpp:
(JSC::SuperRegion::~SuperRegion):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149183 268f45cc-cd09-0410-ab3c-d52691b4dbfc