put sync_fetch_and_add in the portability layer closes[t:2105]

git-svn-id: file:///svn/toku/tokudb@15294 c7de825b-a66e-492c-adef-691d508d4ae1

toku_include/toku_atomic.h

+#if !defined(TOKU_ATOMIC_H)
+#define TOKU_ATOMIC_H
+
+#if __GNUC__ && __i386__
+// workaround for a gcc 4.1.2 bug on 32 bit platforms.
+static uint64_t toku_sync_fetch_and_add_uint64(uint64_t *a, uint64_t b) __attribute__((noinline));
+#endif
+
+static int32_t toku_sync_fetch_and_add_int32(int32_t *a, int32_t b) {
+    return __sync_fetch_and_add(a, b);
+}
+
+static uint64_t toku_sync_fetch_and_add_uint64(uint64_t *a, uint64_t b) {
+    return __sync_fetch_and_add(a, b);
+}
+
+#endif