Debugger: Add dumper for Nim's string and sequence types

... and make the auto test infrastructure able to handle
a test. To pass the test, some Nim compiler must be
accessible.

Change-Id: I707aa72c0f3a2ea35c7131cba490cafb41617f6c
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

share/qtcreator/debugger/dumper.py

@@ -1015,7 +1015,8 @@ class DumperBase:
         if arrayByteSize == 0:
             # This should not happen. But it does, see QTCREATORBUG-14755.
             # GDB/GCC produce sizeof == 0 for QProcess arr[3]
-            s = str(value.type)
+            # And in the Nim string dumper.
+            s = value.type.name
             itemCount = s[s.find('[')+1:s.find(']')]
             if not itemCount:
                 itemCount = '100'

share/qtcreator/debugger/misctypes.py

@@ -161,6 +161,25 @@ def qdump__Eigen__Matrix(d, value):
                         s = s + 1
 
 
+#######################################################################
+#
+# Nim
+#
+#######################################################################
+
+def qdump__NimStringDesc(d, value):
+    size, reserved = value.split('pp')
+    data = value.address() + 2 * d.ptrSize()
+    d.putCharArrayHelper(data, size, d.createType('char'), 'utf8')
+
+def qdump__NimGenericSequence__(d, value, regex = "^TY[\d]+$"):
+    size, reserved = d.split('pp', value)
+    data = value.address() + 2 * d.ptrSize()
+    typeobj = value["data"].type.dereference()
+    d.putItemCount(size)
+    d.putArrayData(data, size, typeobj)
+    d.putBetterType("%s (%s[%s])" % (value.type.name, typeobj.name, size))
+
 #######################################################################
 #
 # D