build: Sketch a Clang/Linux platform config.
 - Currently just tries to build a full library for i386/x86_64.

 - This is made substantially more complicated by the lack of a generalized way
   to check for/invoke cross compilers. For now, we just try and make it work
   for the matched arch, and rely on the host CC being Clang.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@145322 91177308-0d34-0410-b5e6-96231b3b80d8
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