[Beignet] [BUG] piglit test case fail (get-global-size)

[Sun, Yi]

I'm not sure it is caused by the built-in function get-global-size
specified. 
Anyone has any idea?

reproduce step:
[piglit]# bin/cl-program-tester
tests/cl/program/execute/get-global-size.cl


Output:
## Test: get_global_id
(/GFX/Test/Piglit/piglit/tests/cl/program/program-tester.c) ##

# Platform supporting only version 1.0. Running test on that version.
# Running on:
#   Platform: Experiment Intel Gen OCL Driver
#   Device: Intel HD Graphics Family
#   OpenCL version: 1.1
#   OpenCL C version: 1.0
#   Build options: 
ASSERTION FAILED: TODO Boolean values cannot escape their definition
basic block
  at
file /home/works/opencl/beignet/backend/src/llvm/llvm_gen_backend.cpp,
function void gbe::GenWriter::emitMovForPHI(llvm::BasicBlock*,
llvm::BasicBlock*), line 844
Stack dump:
0.      Running pass 'Function Pass Manager' on module
'/tmp/file292g7Y.ll'.
1.      Running pass 'Gen Back-End' on function '@fill3d'


Thanks
  --Sun, Yi