cmd/compile: label LoadReg with line number of the use
A tentative fix of #16380. It adds "line" everywhere...
This also reduces binary size slightly (cmd/go on ARM as an example):
before after
total binary size
8068097 8018945 (-0.6%)
.gopclntab
1195341 1179929 (-1.3%)
.debug_line 689692 652017 (-5.5%)
Change-Id: Ibda657c6999783c5bac180cbbba487006dbf0ed7
Reviewed-on: https://go-review.googlesource.com/25082
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>