Get rid of fastMallocGoodSize() and replace it with something generic.

Source/wtf/QuantizedAllocation.cpp

Index: Source/wtf/QuantizedAllocation.cpp
diff --git a/Source/wtf/SpinLock.h b/Source/wtf/QuantizedAllocation.cpp
similarity index 73%
copy from Source/wtf/SpinLock.h
copy to Source/wtf/QuantizedAllocation.cpp
index ae2f11675f7e006b22994b0de6695d700f2e4dda..d918e6bae9d24a88aafc168eb584717ad534aa09 100644
--- a/Source/wtf/SpinLock.h
+++ b/Source/wtf/QuantizedAllocation.cpp
@@ -28,32 +28,27 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WTF_SpinLock_h
-#define WTF_SpinLock_h
-
-// DESCRIPTION
-// spinLockLock() and spinLockUnlock() are simple spinlock primitives based on
-// the standard CPU primitive of atomic increment and decrement of an int at
-// a given memory address.
-
-#include "wtf/Atomics.h"
+#include "config.h"
+#include "wtf/QuantizedAllocation.h"
 
 namespace WTF {
 
-ALWAYS_INLINE void spinLockLock(int volatile* lock)
-{
-    while (atomicIncrement(lock) != 1)
-        atomicDecrement(lock);
-}
+unsigned short QuantizedAllocation::table[QuantizedAllocation::kTableSize];
 
-ALWAYS_INLINE void spinLockUnlock(int volatile* lock)
+void QuantizedAllocation::init()
 {
-    atomicDecrement(lock);
+    size_t currAllocation = 0;
+    size_t currRounding = kMinRounding;
+    size_t currRoundingLimit = kMinRoundingLimit / 2;
+    size_t numCurrRounding = 0;
+    for (size_t i = 0; i < kTableSize; ++i) {
+        table[i] = currRounding - 1;
+        currAllocation += kMinRoundingLimit;
+        if (currAllocation == currRoundingLimit * 2) {
+            currRoundingLimit *= 2;
+            currRounding *= 2;
+        }
+    }
 }
 
 } // namespace WTF
-
-using WTF::spinLockLock;
-using WTF::spinLockUnlock;
-
-#endif // WTF_PartitionAlloc_h