Add a class ValueObjectConstResultCast.

Summary:
Other changes around the main change include:

1. Add a method Cast to ValueObjectConstResult, ValueObjectConstResultImpl
and ValueObjectConstResultChild.

2. Add an argument |live_address| of type lldb::addr_t to the constructor
of ValueObjectConstResultChild. This is passed on to the backing
ValueObjectConstResultImpl object constructor so that the address of the
child value can be calculated properly.

Reviewers: granata.enrico, clayborg

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D11203

llvm-svn: 242374

lldb/test/python_api/value/TestValueAPI.py

@@ -137,6 +137,12 @@ class ValueAPITestCase(TestBase):
         self.DebugSBValue(val2)
         self.assertTrue(child.GetValue() == val2.GetValue() and
                         child.GetSummary() == val2.GetSummary())
+
+        val_i = target.EvaluateExpression('i')
+        val_s = target.EvaluateExpression('s')
+        val_a = target.EvaluateExpression('a')
+        self.assertTrue(val_s.GetChildMemberWithName('a').AddressOf(), VALID_VARIABLE)
+        self.assertTrue(val_a.Cast(val_i.GetType()).AddressOf(), VALID_VARIABLE)
         
 if __name__ == '__main__':
     import atexit