Progress on removing 'the_index' convenience wrappers. * ab/fewer-the-index-macros: cocci: apply "pending" index-compatibility to some "builtin/*.c" cache.h & test-tool.h: add & use "USE_THE_INDEX_VARIABLE" {builtin/*,repository}.c: add & use "USE_THE_INDEX_VARIABLE" cocci: apply "pending" index-compatibility to "t/helper/*.c" cocci & cache.h: apply variable section of "pending" index-compatibility cocci & cache.h: apply a selection of "pending" index-compatibility cocci: add a index-compatibility.pending.cocci read-cache API & users: make discard_index() return void cocci & cache.h: remove rarely used "the_index" compat macros builtin/{grep,log}.: don't define "USE_THE_INDEX_COMPATIBILITY_MACROS" cache.h: remove unused "the_index" compat macros