Add support for musl-libc on Linux

[Lei Zhang via llvm-commits]

Hi,

The first patch introduces musl as a new environment type in LLVM; the
second helps clang to find musl's dynamic linker, which has a
different naming scheme from glibc's.

The two patches together enable clang to support targets like
"x86_64-pc-linux-musl" and build binaries against musl-libc instead of
glibc. This make it easy for clang to work on some musl-based systems
like Alpine Linux and certain flavors of Gentoo.


Regards,
Lei
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