fs: rework f2fs
Revert "arm: fix LTO compatibility"

This reverts commit cfbb22f1217224e6f0304dfad1ab9da6adea58b6.
Revert "lto: add liblto_plugin.so to KBUILD_ARFLAGS"

This reverts commit b4c24b187cd4a7cb1c25653e98aba59941def8b5.
Revert "Merge LTO-build from linux-misc"

This reverts commit d3a095d507d821fc5784a13bc799560d3c650328.
Revert "bcmdhd: fix redefined symbol"

This reverts commit 2a2aecb38ec5fdc23ae62af7e013c962a6492fc1.