Macros that are defined under config but not used anywhere.

[Richard Earnshaw]

ARM_INDEX_REGISTER_RTX_P

Probably dead (I think this is now a function), but I'll check.

FIRST_LO_REGNUM
FL_VFPV2
TARGET_CPU_arm250
TARGET_CPU_arm3
TARGET_CPU_arm600
TARGET_CPU_arm7
TARGET_CPU_arm700
TARGET_CPU_arm7100
TARGET_CPU_arm7500
TARGET_CPU_arm7dm
TARGET_CPU_arm7dmi

Completeness

TARGET_FPE

Probably a bug, it's used to check a command line option, but seems to be 
ignored at present.

TARGET_SOFT_FLOAT_ABI

Completeness