Bug 120246

Crashes are occurring when running JSC and layout tests on the EFL, GTK and Qt ports after r154498. http://trac.webkit.org/changeset/154498 http://build.webkit.org/builders/GTK%20Linux%2064-bit%20Release/builds/40093 http://build.webkit.org/builders/EFL%20Linux%2064-bit%20Release%20WK1/builds/1428 http://build.webkit.org/builders/Qt%20Linux%20Release/builds/62368 The crashes are occurring only on release builds due to the TcMalloc use being enforced under that configuration. The crashes disappear if ENABLE_GLOBAL_FASTMALLOC_NEW is defined to 1, or if the system malloc is also enforced for the release configuration. All the affected ports set this define to 0 (and so does the AppleWin port, but it doesn't currently build so I can't confirm crashes there). Disabling the optimizations shows that the crash occurs in WTF::deleteOwnedPtr<WTF::CompressedVector<JSC::ExpressionRangeInfo> >(WTF::CompressedVector<JSC::ExpressionRangeInfo>*), due to the `delete ptr` call. The crash occurs because the pointer was allocated through fastMalloc (in GenericCompressedData::create), but is being freed as if it were allocated by the system malloc on the affected systems. fastFree() should be used instead.