Add an "enabled" guard around dumpStack

Without this the logging mutex is grabbed each call which can clash with
logging in other threads adding to jitter.

indra/llcommon/llcallstack.h

@@ -79,9 +79,22 @@ struct LLContextStatus
 
 LL_COMMON_API std::ostream& operator<<(std::ostream& s, const LLContextStatus& context_status);
 
+// <FS:Beq> Store the check to avoid the nasty mutex monster that lies within
+// Note that this won't work quite as expected if called with a variable tag
+// No current use cases do this though, nor are they likely.
+/* #define dumpStack(tag) \ 
+-    if (debugLoggingEnabled(tag)) \
+-    { \
+-        LLCallStack cs; \
+-        LL_DEBUGS(tag) << "STACK:\n" << "====================\n" << cs << "====================" << LL_ENDL; \
+-    }
+*/
 #define dumpStack(tag) \
-    if (debugLoggingEnabled(tag)) \
-    { \
-        LLCallStack cs; \
-        LL_DEBUGS(tag) << "STACK:\n" << "====================\n" << cs << "====================" << LL_ENDL; \
-    }
+    { static auto _isTagEnabled = debugLoggingEnabled(tag); \
+		if (_isTagEnabled) \
+		{ \
+			LLCallStack cs; \
+			LL_DEBUGS(tag) << "STACK:\n" << "====================\n" << cs << "====================" << LL_ENDL; \
+		} \
+	}
+// </FS:Beq>