[sycl-post-link] Refactor algorithm that searches for kernels with device assert built-in call in call stack

[mlychkov]

Current algorithm of searching kernels calling __devicelib_assert_fail (see function getKernelNamesUsingAssert(const Module &M) ) is very inefficient. Current implementation goes over all functions in the module from a kernel down to called device functions even if __devicelib_assert_fail not declared.

Bottom-up approach is way more efficient. I.e. start with __devicelib_assert_fail function declaration and travers users gathering kernels.