[AddressSpace] Intel OpenCL CPU RT crashes with new address space rules

[asavonic]

After #242 Intel OpenCL CPU RT crashes on several LIT tests:

Failing Tests (2):
    SYCLUnitTests :: basic_tests/boolean.cpp
    SYCLUnitTests :: basic_tests/swizzle_op.cpp

This is a known issue and it will be fixed in the next release of Intel OpenCL CPU RT.
Use DISABLE_INFER_AS=1 environment variable as a workaround to switch back to the old address space rules.

[bader]

@asavonic, should be fixed by this release: https://github.com/intel/llvm/releases/tag/2019-07.