Build problem with latest locore.S

[Paul Goyette <paul%whooppee.com@localhost>]

With the latest locore.S I am seeing the following error:

#      link  INSTALL_XEN3_DOMU/netbsd
/build/netbsd-compat/tools/x86_64/amd64/bin/x86_64--netbsd-ld -Map 
netbsd.map --cref -T netbsd.ldscript -Ttext 0xffffffff80200000 -e start 
-X -o netbsd ${SYSTEM_OBJ:[@]:Nswapnetbsd.o} ${EXTRA_OBJ} vers.o 
swapnetbsd.o
locore.o: In function `cpu_switchto':
(.text+0x20b2): undefined reference to `speculation_barrier'
*** [netbsd] Error code 1


+------------------+--------------------------+----------------------------+
| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:          |
| (Retired)        | FA29 0E3B 35AF E8AE 6651 | paul at whooppee dot com   |
| Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd dot org |
+------------------+--------------------------+----------------------------+