This reverts commit 17a84e414adb51ee375d14836d4c2a817b191933.

Patches should have been submitted in the order of:

1. D32852
2. D32854
3. D32431

I mistakenly pushed D32431(3) first. Reverting to push in the correct
order.

llvm-svn: 302217

Summary:
When compiling for GPU, one can now choose to compile for OpenCL or CUDA,
with the corresponding polly-gpu-runtime flag (libopencl / libcudart). The
GPURuntime library (GPUJIT) has been extended with the OpenCL Runtime library
for that purpose, correctly choosing the corresponding library calls to the
option chosen when compiling (via different initialization calls).

Additionally, a specific GPU Target architecture can now be chosen with -polly-gpu-arch (only nvptx64 implemented thus far).

Reviewers: grosser, bollu, Meinersbur, etherzhhb, singam-sanjay

Reviewed By: grosser, Meinersbur

Subscribers: singam-sanjay, llvm-commits, pollydev, nemanjai, mgorny, yaxunl, Anastasia

Tags: #polly

Differential Revision: https://reviews.llvm.org/D32431

llvm-svn: 302215

This prevents a compiler crash.

llvm-svn: 281303