ExpressionParser: silence some GCC warnings

Silence a -Wreorder warning about order of member initialization and a
-Wqual-cast warning about casting away constness.  NFC.

llvm-svn: 260868
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
index eab62ae..235e5c1 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
@@ -822,7 +822,7 @@
     {
         if (namespace_context->getName().str() == std::string(g_lldb_local_vars_namespace_cstr))
         {
-            CompilerDeclContext compiler_decl_ctx(GetClangASTContext(), (void*)context.m_decl_context);
+            CompilerDeclContext compiler_decl_ctx(GetClangASTContext(), const_cast<void *>(static_cast<const void *>(context.m_decl_context)));
             FindExternalVisibleDecls(context, lldb::ModuleSP(), compiler_decl_ctx, current_id);
             return;
         }