Debugger: Pass symbol file to LLDB and use it

Instead of guessing from the executable.

Change-Id: I5f57020446bc5e0f7915dac487a32d673eb97952
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/lldb/lldbengine.cpp

@@ -279,6 +279,7 @@ void LldbEngine::setupEngine()
     cmd2.arg("environment", rp.inferior.environment.toStringList());
     cmd2.arg("processargs", toHex(QtcProcess::splitArgs(rp.inferior.commandLineArguments).join(QChar(0))));
     cmd2.arg("platform", rp.platform);
+    cmd2.arg("symbolfile", rp.symbolFile);
 
     if (terminal()) {
         const qint64 attachedPID = terminal()->applicationPid();