r363086 - For DR712: store on a DeclRefExpr whether it constitutes an odr-use.

[Reid Kleckner via cfe-commits]

The new assert is firing across Chromium, please fix or revert. This is a
reduced test case:

int a;
struct Foo {
  template <typename b, typename c = decltype(a)> void operator()(b, c = a);
};
Foo d;
bool e;
decltype(d(e)) gv;

This causes the "missing non-odr-use marking for unevaluated decl ref"
assertion on SemaExpr.cpp:16227 to fire.
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