[cfe-dev] Memory corruption bug in CodeGenTypes

[Eli Friedman]

Found a pretty serious issue in CodeGenTypes::ConvertNewType: it grabs
a reference to a cell in a map, modifies the map by instantiating the
members of the struct, then writes to the map.  Obviously, this is not
a good thing...

Patch attached, although I'm not sure if it's the right way to fix this.

-Eli
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