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With the new data structures it is trivial to add a new field and we aren't (too) limited as to the number we have. This patch adds a new bit to describe the need for a particular compiler behaviour modification: in this case a quirk in the cortex-m3. * arm-isa.h (enum isa_feature): Add isa_quirk_cm3_ldrd. (ISA_ALL_QUIRKS): New macro. * arm-cores.def (cortex-m3): Add isa_quirk_cm3_ldrd to isa feature list. * arm.c (isa_quirkbits): New feature-list bitmap. (arm_configure_build_target): Ignore quirk bits when comparing an architecture feature list with a CPU feature list. (arm_option_override): Initialize_isa_quirkbits. If the user has not specified -m[no-]fix-cortex-m3-ldrd, automatically enable the feature if isa_quirk_cm3_ldrd appears in the isa feature list. From-SVN: r243701
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