[CUDA] Invoke ptxas and fatbinary during compilation.

[CUDA] Invoke ptxas and fatbinary during compilation.

Summary:
Previously we compiled CUDA device code to PTX assembly and embedded
that asm as text in our host binary.  Now we compile to PTX assembly and
then invoke ptxas to assemble the PTX into a cubin file.  We gather the
ptx and cubin files for each of our --cuda-gpu-archs and combine them
using fatbinary, and then embed that into the host binary.

Adds two new command-line flags, -Xcuda_ptxas and -Xcuda_fatbinary,
which pass args down to the external tools.

Reviewers: tra, echristo

Subscribers: cfe-commits, jhen

Differential Revision: http://reviews.llvm.org/D16082

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@257809 91177308-0d34-0410-b5e6-96231b3b80d8