ci.freebsd.org: powerpcspe build failing due to linker error in assembly code

[Enji Cooper]

Hi,
	The following build issue has been cropping up over the past 6 hours. From https://ci.freebsd.org/job/FreeBSD-head-powerpcspe-build/11154/console :

12:49:01 /usr/src/stand/powerpc/kboot/kerneltramp.S: Assembler messages:
12:49:01 /usr/src/stand/powerpc/kboot/kerneltramp.S:88: Error: Unrecognized opcode: `rldicr'
12:49:01 /usr/src/stand/powerpc/kboot/kerneltramp.S:96: Error: Unrecognized opcode: `rfid'

	This code hasn’t changed for some time. I’m not sure what triggered the issue, but I suspect it has to deal with an external [toolchain] change.
Cheers!
-Enji