Fix promotion of floats to doubles

Use the f variants of the math functions if the input parameter is a
float, saves converting from float to double and running the double
variant of the math function for gaining no precision at all

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3969>

src/mesa/program/program.c

@@ -539,7 +539,7 @@ _mesa_get_min_invocations_per_fragment(struct gl_context *ctx,
                                             SYSTEM_BIT_SAMPLE_POS)))
          return MAX2(_mesa_geometric_samples(ctx->DrawBuffer), 1);
       else if (ctx->Multisample.SampleShading)
-         return MAX2(ceil(ctx->Multisample.MinSampleShadingValue *
+         return MAX2(ceilf(ctx->Multisample.MinSampleShadingValue *
                           _mesa_geometric_samples(ctx->DrawBuffer)), 1);
       else
          return 1;