Haiku: Make gigacage use Overcommit by default

Source/WTF/wtf/Gigacage.cpp

@@ -20,7 +20,7 @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
@@ -48,7 +48,7 @@ void* tryAllocateZeroedVirtualPages(Kind, size_t requestedSize)
 {
     size_t size = roundUpToMultipleOf(WTF::pageSize(), requestedSize);
     RELEASE_ASSERT(size >= requestedSize);
-    void* result = OSAllocator::reserveAndCommit(size);
+    void* result = OSAllocator::reserveUncommitted(size);
 #if ASSERT_ENABLED
     if (result) {
         for (size_t i = 0; i < size / sizeof(uintptr_t); ++i)