[SYCL][NativeCPU] Fix __clc_exp10.

[hvdijk]

In the libspirv builtins, no definitions of fma and ldexp are provided, and there must be no references to them. Call __spirv_ocl_fma and __spirv_ocl_ldexp instead.

[hvdijk]

cc @jsji, I think this was a bad pulldown in #16781 that went unnoticed because most targets have their own exp10 definition rather than using this generic one, before that PR this file was using __spirv_ocl_* functions?

[frasercrmck]

LGTM.

It does look like a pulldown issue. Upstream, and at the next pulldown, these will be __clc_fma and __clc_ldexp. But until then we should stick with the SPIR-V versions.

[hvdijk]

@intel/llvm-gatekeepers This is ready to be merged, thanks.