Documented ClangExpression and made parts of it
more sane (i.e., removed dead arguments, made
sensible defaults, etc.)

llvm-svn: 110990
diff --git a/lldb/source/Expression/ClangFunction.cpp b/lldb/source/Expression/ClangFunction.cpp
index df87222..957be2a 100644
--- a/lldb/source/Expression/ClangFunction.cpp
+++ b/lldb/source/Expression/ClangFunction.cpp
@@ -258,7 +258,7 @@
     if (!m_JITted)
     {
         // Next we should JIT it and insert the result into the target program.
-        if (!JITFunction (exe_ctx, m_wrapper_function_name.c_str()))
+        if (!JITFunction (m_wrapper_function_name.c_str()))
             return false;
 
         if (!WriteJITCode (exe_ctx))