Fix handling of DW_CFA_restore_state

[tberghammer]

Summary

Fix handling of DW_CFA_restore_state

The CFA offset shouldn't be restored to the saved value in case of a DW_CFA_restore_state opcode.

lldb/trunk/source/Symbol/DWARFCallFrameInfo.cpp

while (m_cfi_data.ValidOffset(offset) && offset < end_offset)
                     // These instructions define a stack of information. Encountering the
                     // DW_CFA_remember_state instruction means to save the rules for every
                     // register on the current row on the stack. Encountering the
                     // DW_CFA_restore_state instruction means to pop the set of rules off
                     // the stack and place them in the current row. (This operation is
                     // useful for compilers that move epilogue code into the body of a
                     // function.)
                     {
+                        lldb::addr_t offset = row->GetOffset ();
                         row = stack.back ();
                         stack.pop_back ();
+                        row->SetOffset (offset);
                     }
                     break;
 
                 case DW_CFA_def_cfa             : // 0xC    (CFA Definition Instruction)
                     {
                         // Takes two unsigned LEB128 operands representing a register
                         // number and a (non-factored) offset. The required action
                         // is to define the current CFA rule to use the provided