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[TargetLibraryInfo] add mappings from LLVM sin/cos intrinsics to SVML calls

Authored by spatel on Jun 7 2018, 11:21 AM.

Description

[TargetLibraryInfo] add mappings from LLVM sin/cos intrinsics to SVML calls

These weren't included in D19544 - probably just an oversight.
D40044 made it more likely that we'll have LLVM math intrinsics rather
than libcalls, so this bug was more easily exposed.
As the tests/code show, we already have the complete mappings for pow/exp/log.

I don't have any experience with SVML, so I don't know if anything else is
missing. It's also not clear to me that we should be doing this transform in
IR rather than DAG/isel, but that's a separate issue.

Differential Revision: https://reviews.llvm.org/D47610

llvm-svn: 334211