[SYCL][libdevice] Solve inline attr conflict when building libdevice

[jinge90]

Signed-off-by: jinge90 [email protected]

Previous patch #5979 to apply "always_inline" to all libdevice functions have some problem, so libdevice functions are required to be no-inline. Currently, we have following groups of libdevice functions:

1. assert support //Not sure inline impact to those functions, so we don't apply always_inline to assert for safety.
2. string support // No problem for string utils, apply always_inline
3. cmath/cmath-fp64 //No problem for cmah utils, apply always_inline
4. complex/complex-fp64 //No problem for complex math utils, apply always_inline
5. ITT // Some functions in ITT support are required to be no-inline, we shouldn't apply always_inline to them.

[jinge90]

Hi, all.
Could you help review this patch?

Thanks very much.