Tim Northover 0150333a3c Create valid LValue to represent null pointers in constant exprs ...

We were leaving the SubobjectDesignator in a surprising situation, where
it was allegedly valid but didn't actually refer to a type. This caused
a crash later on.

This patch fills out the SubobjectDesignator with the pointee type (as
happens in other evaluations of constant pointers) so that we don't
crash later.

llvm-svn: 303957

2017-05-26 02:16:00 +00:00

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