Look into removing the volatile qualifier from conversions test

int/uint to float host side reference code currently uses volatile qualifier to prevent clang optimizations which cause the test to fail. eg:

static void int2float( void *out, void *in)
{
// Use volatile to prevent optimization by Clang compiler
volatile cl_int l = ((cl_int *)in)[0];
}

This qualifier appears at several places in the code. Research the problem at a deeper level and propose a solution that does not involve the use of 'volatile'.

Start by locating the conversions test's host-side int/uint-to-float reference functions and all uses of the volatile qualifier. Reproduce the Clang optimization failure, then investigate a solution that removes volatile while preserving correct reference results; done means the conversions test passes without those qualifiers.

Written by the indexing model from the issue text.