cmd/compile: rename dxxx -> dxxxLSym

cmd/compile: rename dxxx -> dxxxLSym

Follow-up to previous CL.

gorename -from '"cmd/compile/internal/gc".duintxxLSym' -to duintxx
gorename -from '"cmd/compile/internal/gc".duint8LSym' -to duint8
gorename -from '"cmd/compile/internal/gc".duint16LSym' -to duint16
gorename -from '"cmd/compile/internal/gc".duint32LSym' -to duint32
gorename -from '"cmd/compile/internal/gc".duintptrLSym' -to duintptr
gorename -from '"cmd/compile/internal/gc".dbvecLSym' -to dbvec
gorename -from '"cmd/compile/internal/gc".dsnameLSym' -to dsname
gorename -from '"cmd/compile/internal/gc".dsymptrLSym' -to dsymptr
gorename -from '"cmd/compile/internal/gc".dsymptrOffLSym' -to dsymptrOff
gorename -from '"cmd/compile/internal/gc".dsymptrWeakOffLSym' -to dsymptrWeakOff

Passes toolstash-check.

Change-Id: I007f57340f9e8b1468553242556ae25a71167e8c
Reviewed-on: https://go-review.googlesource.com/41397
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>