Make the Expression Execution result enum available to the SB API layer.
Add a callback that will allow an expression to be cancelled between the
expression evaluation stages (for the ClangUserExpressions.)

<rdar://problem/16790467>, <rdar://problem/16573440>

llvm-svn: 207944
diff --git a/lldb/source/API/SBTarget.cpp b/lldb/source/API/SBTarget.cpp
index 817f1bc..bae4b76 100644
--- a/lldb/source/API/SBTarget.cpp
+++ b/lldb/source/API/SBTarget.cpp
@@ -2611,7 +2611,7 @@
     Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
     Log * expr_log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
     SBValue expr_result;
-    ExecutionResults exe_results = eExecutionSetupError;
+    ExpressionResults exe_results = eExecutionSetupError;
     ValueObjectSP expr_value_sp;
     TargetSP target_sp(GetSP());
     StackFrame *frame = NULL;