Delete TARGET_LRA_P from those targets that set it to "true"

Delete TARGET_LRA_P from those targets that set it to "true"

A few targets already always want LRA; those then do not need to override
the default anymore.

2016-09-14  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/aarch64/aarch64.c (TARGET_LRA_P): Delete macro.
	* config/arm/arm.c (TARGET_LRA_P): Delete macro.
	* config/i386/i386.c (TARGET_LRA_P): Delete macro.
	* config/nds32/nds32.c (TARGET_LRA_P): Delete macro.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@240132 138bc75d-0d04-0410-961f-82ee72b054a4