[Bug target/113939] Switch m68k to LRA

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113939
Bug 113939 depends on bug 116429, which changed state.

Bug 116429 Summary: [LRA] [M86k] Wrong spill offset
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116429

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