PR #11767: Add SYCL build script
PR #11767: Add SYCL build script

Imported from GitHub PR https://github.com/openxla/xla/pull/11767

This is a sub PR of https://github.com/openxla/xla/pull/9042, it adds a script to build xla with `--config=sycl`.
Here is how to use:
```bash
workspace=$1
xla_path=$workspace/xla
cd $workspace
git clone -b yang/ci https://github.com/Intel-tensorflow/xla xla
bash $xla_path/build_tools/sycl/build.sh $workspace
```
Copybara import of the project:

--
d811bba1548f0c983da473a0940b1ea3d8b2c436 by Sheng, Yang <yang.sheng@intel.com>:

Add SYCL build script

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0c2500b703b73bc340ccc9e3817c7ce54cc8d718 by Sheng, Yang <yang.sheng@intel.com>:

change path

Merging this change closes #11767

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/11767 from Intel-tensorflow:yang/ci 0c2500b703b73bc340ccc9e3817c7ce54cc8d718
