debugger: rework dumping arrays of plain data

Simple array data can be fetched in one go.
The "normal" way gdb asks the server for contents is one item
at a time, at ~3ms per round trip. Now we get 2000 in 200ms.

This also introduces a re-usable readRawMemory function and
removes a few checkAccess calls which will be triggered anyways.

Change-Id: Ic07a3d6593fd2ea45f7a8058509118fe22a845bb
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/watchutils.h

@@ -72,7 +72,13 @@ enum DebuggerEncoding
     Hex2EncodedLocal8BitWithQuotes         = 13,
     JulianDate                             = 14,
     MillisecondsSinceMidnight              = 15,
-    JulianDateAndMillisecondsSinceMidnight = 16
+    JulianDateAndMillisecondsSinceMidnight = 16,
+    Hex2EncodedInt1                        = 17,
+    Hex2EncodedInt2                        = 18,
+    Hex2EncodedInt4                        = 19,
+    Hex2EncodedInt8                        = 20,
+    Hex2EncodedFloat4                      = 21,
+    Hex2EncodedFloat8                      = 22
 };
 
 bool isEditorDebuggable(Core::IEditor *editor);
@@ -103,6 +109,9 @@ QString cppExpressionAt(TextEditor::ITextEditor *editor, int pos,
 QString cppFunctionAt(const QString &fileName, int line);
 // Decode string data as returned by the dumper helpers.
 QString decodeData(const QByteArray &baIn, int encoding);
+// Decode string data as returned by the dumper helpers.
+void decodeArray(WatchData *list, const WatchData &tmplate,
+    const QByteArray &rawData, int encoding);
 
 // Get variables that are not initialized at a certain line
 // of a function from the code model. Shadowed variables will