[PATCH, rs6000] Make branch_cost changeable on rs6000

[Andrew Pinski]

This is because on the 74xx, it is faster for branches than to use 
subfe/adde and subfc/addc
pairs because subfe/adde are serializing instructions on those 
processors.

ChangeLog:
2003-02-02  Andrew Pinski  <pinskia@physics.uc.edu>

	* config/rs6000/rs6000.c: (rs6000_branch_cost_string): New Var.
	(rs6000_branch_cost): New Var. (rs6000_override_options): Set 
rs6000_branch_cost.
	* config/rs6000/rs6000.h: (TARGET_OPTIONS): Add `branch-cost='.
	(rs6000_branch_cost_string): Declare. (rs6000_branch_cost): Declare.
	(BRANCH_COST): Use rs6000_branch_cost.


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Thanks,
Andrew Pinski
apinski@apple.com
pinskia@physics.uc.edu