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This commit is a broad update across libclc to use the CLC conversion builtins in CLC functions, even those with a '__clc' prefix in the generic folder. This better prepares them for an official move to the CLC library in time. The CLC conversion builtins have an additional benefit in that they support scalars, unlike the __builtin_convertvector builtin which we were using previously. This allows us to simplify some shared definitions. There is one change to the IR, in the scalar upsample(char, uchar) builtin. It now sign-extends the first argument to i16, where before it zero-extended it. This appears to be correct, and matches the vector behaviour.