Patch for rs6000 const doubles

[Jeffrey A Law]

  In message < 199711131707.MAA03473@tiktok.cygnus.com >you write:
  > Jim or Jeff, please apply the following patch to the release branch of
  > egcs (I've already applied it to the development branch):
  > 
  > Thu Nov 13 11:07:41 1997  Michael Meissner  <meissner@cygnus.com>
  > 
  > 	* rs6000.c (num_insns_constant): Use REAL_VALUE_FROM_CONST_DOUBLE to
  > 	pick apart floating point values, instead of using CONST_DOUBLE_LOW
  > 	and CONST_DOUBLE_HIGH.
  > 
  > 	* rs6000.md (define_splits for DF constants): Use the appropriate
  > 	REAL_VALUE_* interface to pick apart DF floating point constants in
  > 	a machine independent fashion.
Done.
jeff