[cfe-dev] [compiler-rt] Adding -lm to the clang driver when using compiler-rt

[Jordan Rupprecht via cfe-dev]

Hey all,
I have a small change to add -lm when using compiler-rt in
https://reviews.llvm.org/D49330, since it appears that some of the builtins
need it. I got linker errors from __divdc3, __divsc3, and __divxc3, but
there could others.

It seems like a simple change to me and works for the cases I've tried, but
before landing it I thought I'd bring it up here to see if anyone has
concerns about it. Feel free to add yourself as a reviewer if you have any
opinion about this :)

Thanks -- Jordan
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