Richard Smith 301bc21fd0 Make Sema::getPrintingPolicy less ridiculously expensive. This used to perform ...

an identifier table lookup, *and* copy the LangOptions (including various
std::vector<std::string>s). Twice. We call this function once each time we start
parsing a declaration specifier sequence, and once for each call to Sema::Diag.

This reduces the compile time for a sample .c file from the linux kernel by 20%.

llvm-svn: 270009

2016-05-19 01:39:10 +00:00

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