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/intel/common/gen_l3_config.c

@@ -245,7 +245,7 @@ gen_diff_l3_weights(struct gen_l3_weights w0, struct gen_l3_weights w1)
       float dw = 0;
 
       for (unsigned i = 0; i < GEN_NUM_L3P; i++)
-         dw += fabs(w0.w[i] - w1.w[i]);
+         dw += fabsf(w0.w[i] - w1.w[i]);
 
       return dw;
    }