Added a feature where registers can be referred to
using special $-variables from expressions.

(lldb) expr $rip

These variables are available for reading and
writing.


git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@120367 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Expression/ClangExpressionVariable.cpp b/source/Expression/ClangExpressionVariable.cpp
index d1ae1d5..6a78363 100644
--- a/source/Expression/ClangExpressionVariable.cpp
+++ b/source/Expression/ClangExpressionVariable.cpp
@@ -29,6 +29,7 @@
     m_name(),
     m_user_type (TypeFromUser(NULL, NULL)),
     m_store (NULL),
+    m_register_info (NULL),
     m_index (0),
     m_parser_vars(),
     m_jit_vars (),