Debugger: Execute additional attach commands for LLDB

This allows setting _Preferences > Debugger > GDB > Additional Attach
Commands_ with the content:

  process handle SIGSEGV --pass true --stop false --notify true

which results in the debugger not stopping in assembler for Java runtime
exceptions.

Task-number: QTCREATORBUG-29928
Change-Id: I8edf0d79dcccfe7ddb27502edb122fb5fb2c646c
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/lldb/lldbengine.cpp

@@ -30,6 +30,7 @@
 
 #include <projectexplorer/runcontrol.h>
 
+#include <utils/algorithm.h>
 #include <utils/environment.h>
 #include <utils/process.h>
 #include <utils/processinterface.h>
@@ -328,6 +329,16 @@ void LldbEngine::handleLldbStarted()
                 runEngine();
             };
             runCommand(cmd3);
+
+            // Execute post attach commands
+            QStringList commands = settings().gdbPostAttachCommands().split('\n');
+            commands = Utils::filtered(commands, [](const QString line) {
+                const QString trimmed = line.trimmed();
+                return !trimmed.isEmpty() && !trimmed.startsWith('#');
+            });
+            for (const QString &cmd : commands) {
+                executeDebuggerCommand(cmd);
+            }
         } else {
             notifyEngineSetupFailed();
         }