David Majnemer 7ffd0b4409 [Lex] inferModuleFromLocation should do no work if there are no modules ...

getModuleContainingLocation ends up on the hot-path for typical C code
which can lead to calls to getFileIDSlow.

To speed this up, short circuit inferModuleFromLocation when there
aren't any modules, implicit or otherwise.

This shaves 4-5% build time when building the linux kernel.

llvm-svn: 269687

2016-05-16 20:30:03 +00:00

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