Revert "Fixed a bug where const this would cause parser errors about $__lldb_expr."

This reverts commit r267833 as it breaks the build. It looks like some work in progress got
committed together with the actual fix, but I'm not sure which one is which, so I'll revert the
whole patch and let author resumbit it after fixing the build error.

llvm-svn: 267861
diff --git a/lldb/source/Expression/LLVMUserExpression.cpp b/lldb/source/Expression/LLVMUserExpression.cpp
index 0b96980..60f68b1 100644
--- a/lldb/source/Expression/LLVMUserExpression.cpp
+++ b/lldb/source/Expression/LLVMUserExpression.cpp
@@ -59,6 +59,7 @@
       m_in_objectivec_method(false),
       m_in_static_method(false),
       m_needs_object_ptr(false),
+      m_const_object(false),
       m_target(NULL),
       m_can_interpret(false),
       m_materialized_address(LLDB_INVALID_ADDRESS)