[cfe-dev] LangOptions of ASTUnit::LoadFromPCHFile() goes out of scope

[Zhongxing Xu]

The LangOptions LangInfo is a local variable of
ASTUnit::LoadFromPCHFile(). When it goes out of scope, it is still
referenced by the preprocessor (ASTUnit.cpp:126). I think the
preprocessor should refer to the LangOptions of ASTContext, which owns
one copy of LangOptions.

-Zhongxing