[TargetLibraryInfo] Teach isValidProtoForLibFunc about tan

We would fail to validate the type of the tan function which would cause
downstream users of isValidProtoForLibFunc to assert.

This fixes PR28143.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272802 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed