FreeBSD/src 19a227e (r344252)sys/conf ldscript.riscv

Avoid orphan sections between __bss_start and .(s)bss.

Ensure __bss_start is associated with the next section
in case orphan sections are placed directly after .sdata,
as has been seen to happen with LLD.

Submitted by:   "J.R.T. Clarke" <jrtc4 at cam.ac.uk>
Differential Revision:  https://reviews.freebsd.org/D18429
DeltaFile
+4-0sys/conf/ldscript.riscv
+4-01 files

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