Fix testkjs in 64-bit.
When built for 64-bit the TCMalloc spin lock uses pthread mutexes rather than a custom spin lock
implemented in assembly. If we fail to initialize the pthread mutex, attempts to lock or unlock
it will fail and trigger a call to abort.
Reviewed by Darin.
* wtf/FastMalloc.cpp: Initialize the spin lock so that we can later lock and unlock it.
* wtf/TCSpinLock.h: Add an Init method to the optimised spin lock.
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@28449
268f45cc-cd09-0410-ab3c-
d52691b4dbfc