sunos: unbreak build after v8 downgrade

Commit 3d67f895 ("fix generation of v8 constants on freebsd") is an
unfortunate victim of this rollback.

Revert "dtrace: fix generation of v8 constants on freebsd"
Revert "dtrace: More style"
Revert "dtrace: Make D style more D-ish"
Revert "dtrace: x64 ustack helper"
Revert "dtrace: fix style in ustack helper"
Revert "dtrace: SeqAsciiString was renamed to SeqOneByteString in v8"

This reverts commit 3d67f895.
This reverts commit 321b8eec.
This reverts commit 38df9d51.
This reverts commit f9afb3f0.
This reverts commit 13296e4b.
This reverts commit 3b715edd.