[SYCL] Enable libm for spirv64 in SYCL

[jinge90]

Experimental PR to enable LLVM libc math implementation in sycl toolchain to replace libdevice, try best to follow LLVM libc style to rely on '_builtin*' functions for some simple math functions and build generic implemation for SPIRV64 target for others, still in progress.

[jinge90]

Hi, @intel/dpcpp-devops-reviewers
I am working on enabling LLVM libc/libm for SYCL and LLVM libc/libm building depends on 'yaml'. It seems that this module is available on Linux machine in pre-ci environment but missing on Windows machine in pre-ci environment. I got following error in 'Windows self build':
Traceback (most recent call last):
File "D:\github_work\llvm\llvm\src\libc\utils\hdrgen\main.py", line 11, in
from hdrgen.main import main
File "D:\github_work\llvm\llvm\src\libc\utils\hdrgen\hdrgen\main.py", line 17, in

from hdrgen.yaml_to_classes import load_yaml_file, fill_public_api

File "D:\github_work\llvm\llvm\src\libc\utils\hdrgen\hdrgen\yaml_to_classes.py", line 11, in

import yaml

ModuleNotFoundError: No module named 'yaml'

Is it possible to install 'ymal' on Windows machine in pre-ci environment?
Thanks very much.

[sarnex]

I will try to get to it this week, I'll let you know here when I have updates, thanks.