[libclc] Fix int<->float conversion builtins (#126905) While working on moving the conversion builtins to the CLC library in 25c05541 it was discovered that many weren't passing the OpenCL-CTS tests. As it happens, the clspv-specific code for conversion implementations between integer and floating-point types was more correct. However: * The clspv code was generating 'sat' conversions to floating-point types, which are not legal * The clspv code around rtn/rtz conversions needed tweaking as it wasn't validating when sizeof(dst) > sizeof(src), e.g., int -> double. With this commit, the CTS failures seen before have been resolved. This also assumes that the new implementations are correct also for clspv. If this is the case, then 'clc' and 'clspv' modes are mutually exclusive and we can simplify the build process for conversions by not building clc-clspv-convert.cl.
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