[Bug target/113939] Switch m68k to LRA

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113939
Bug 113939 depends on bug 120169, which changed state.

Bug 120169 Summary: [LRA] needs to call fixup_args_size_notes to maintain REG_ARGS_SIZE notes
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120169

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED