Move HAZPTR_DEBUG macro definition to target

Summary:
Move the definition of `HAZPTR_DEBUG` from code to the target to fix modular
build. This is needed because `HAZPTR_DEBUG` is effectively a configuration
macro affecting the API.

Reviewed By: magedm

Differential Revision: D9256127

fbshipit-source-id: 44deb0e915373ea88206098544b03fa335b31a22

folly/experimental/hazptr/debug.h

@@ -17,13 +17,15 @@
 
 #include <glog/logging.h>
 
-#ifndef HAZPTR_DEBUG
-#define HAZPTR_DEBUG false
+#ifdef HAZPTR_DEBUG
+#define HAZPTR_DEBUG_ HAZPTR_DEBUG
+#else
+#define HAZPTR_DEBUG_ false
 #endif
 
 #define HAZPTR_DEBUG_PRINT(...)                      \
   do {                                               \
-    if (HAZPTR_DEBUG) {                              \
+    if (HAZPTR_DEBUG_) {                             \
       VLOG(2) << __func__ << " --- " << __VA_ARGS__; \
     }                                                \
   } while (false)

folly/experimental/hazptr/test/HazptrTest.cpp

@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#define HAZPTR_DEBUG true
 #define HAZPTR_STATS true
 #define HAZPTR_SCAN_THRESHOLD 10