Back out startup buffer size change (but leave diagnostic).

tools/trace-malloc/lib/nsTraceMalloc.c

@@ -274,7 +274,7 @@ struct AllocationFuncs
 
 typedef struct logfile logfile;
 
-#define STARTUP_TMBUFSIZE (64 * 1024)
+#define STARTUP_TMBUFSIZE (16 * 1024)
 #define LOGFILE_TMBUFSIZE (16 * 1024)
 
 struct logfile {