Unblock synchronous signal if it is used

Allow synchronous signals to get unblocked when
a signal handler is set for them.

Issue: eclipse-openj9/openj9#10744

Signed-off-by: Abdulrahman Alattas <rmnattas@gmail.com>

port/unix/omrsignal.c

@@ -1269,16 +1269,14 @@ registerSignalHandlerWithOS(OMRPortLibrary *portLibrary, uint32_t portLibrarySig
 		return OMRPORT_SIG_ERROR;
 	}
 
-	/* If a process has blocked an asynchronous signal, then the signal stays
-	 * blocked in the sub-processes across fork(s) and exec(s). A blocked
+	/* If a process has blocked a signal, then the signal stays blocked
+	 * in the sub-processes across fork(s) and exec(s). A blocked
 	 * signal prevents its OS signal handler to be invoked. A signal is
 	 * unblocked as an OS signal handler is installed for it in case a
 	 * parent process has blocked it.
 	 */
-	if (OMR_ARE_ALL_BITS_SET(OMRPORT_SIG_FLAG_SIGALLASYNC, portLibrarySignalNo)) {
-		if (0 != unblockSignal(unixSignalNo)) {
-			return OMRPORT_SIG_ERROR;
-		}
+	if (0 != unblockSignal(unixSignalNo)) {
+		return OMRPORT_SIG_ERROR;
 	}
 
 	memset(&newAction, 0, sizeof(struct sigaction));