[PATCH] Allow (Object *)kMyGlobalCFObjc casts without bridging

[Ben Langmuir]

Hi John,

As we discussed: 

Allow (Object *)kMyGlobalCFObj casts without bridging
    
Previously we allowed these casts only for constants declared in system
headers, which we assume are retain/release-neutral. Now also allow them
for constants in user headers, treating them as +0.  Practically, this
means that we will now allow:
id x = (id)kMyGlobalConst;
    
But unlike with system headers we cannot mix them with +1 values:
id y = (id)(b ? kMyGlobalConst : [Obj newValAtPlusOne]); // error
id z = (id)(b ? kSystemGlobalConst: [Obj newValAtPlusOne]); // OK

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