Removed section regarding "internal temporaries".

This section is was vaguely worded, and was old enough that the meaning of said internal tempories has been lost over time.

The reference to computer performance is also only true in fundamentally scalar code - the statement made was not true for SIMD or potentially out of order code.

Author: maxhaton

spec/float.dd

@@ -6,14 +6,6 @@ $(HEADERNAV_TOC)
 
 $(H2 $(LNAME2 fp_intermediate_values, Floating-Point Intermediate Values))
 
-        $(P On many computers, greater
-        precision operations do not take any longer than lesser
-        precision operations, so it makes numerical sense to use
-        the greatest precision available for internal temporaries.
-        The philosophy is not to dumb down the language to the lowest
-        common hardware denominator, but to enable the exploitation
-        of the best capabilities of target hardware.
-        )
 
         $(P For floating-point operations and expression intermediate values,
         a greater precision can be used than the type of the