NCGenerics: handle failure to load stdlib #75211
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The stdlib module can end up being a non-null ModuleDecl that contains no files, due to a failure to load the stdlib. In such an unusual case, fall-back to synthesizing Copyable/Escapable into the Builtin module so that Sema can proceed. rdar://129092011
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The stdlib module can end up being a non-null
ModuleDecl*that containsno files, due to a failure to load the stdlib. I've seen only backtraces showing such crashes, but don't know to reproduce them.
In such an unusual case, fall-back to synthesizing Copyable/Escapable
into the Builtin module so that Sema can proceed.
rdar://129092011