build failure of mips decstation_r4k_defconfig with binutils-2_37

[Sudip Mukherjee]

Hi All,

While I was testing v5.4.142-rc2 I noticed mips build of
decstation_r4k_defconfig fails with binutils-2_37. The error is:

arch/mips/dec/prom/locore.S: Assembler messages:
arch/mips/dec/prom/locore.S:29: Error: opcode not supported on this
processor: r4600 (mips3) `rfe'

I have also reported this at https://sourceware.org/bugzilla/show_bug.cgi?id=28241

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Regards
Sudip