[cfe-dev] Confusing comments in PCHReader

[Zhongxing Xu]

In file PCHReader.cpp:1472: "Initialization of builtins and library
builtins occurs before the ...". But actually we do not initialize any
builtins if pch file is included, see clang-cc.cpp:2292. Only keywords
and pragmas are initialized at that point. Shall we change this
comment to: "Initialization of keywords and pragmas occurs before
..."?

And since keywords can not be redefined, only pragmas can be
repopulated. Is it right?

-Zhongxing