code review 113180043: cmd/ld: change DWARF encoding for array lengths

cmd/ld: change DWARF encoding for array lengths
They can be large, so use a varint encoding rather than only one byte.

[r, 2014-07-15 16:17:25]

Hello rsc (cc: golang-codereviews@googlegroups.com),

I'd like you to review this change to
https://code.google.com/p/go

[iant, 2014-07-15 21:06:45]

LGTM

[rsc, 2014-07-15 21:16:46]

LGTM

[rsc, 2014-07-15 21:17:54]

There is a corner case with 0-length arrays that have never been
well-described in DWARF. Yesterday you mentioned DW_AT_count, which I
hadn't heard of before. If that is the real len, not len-1, it might be
worth continuing to write out upper bound but also writing out count, so
that the Go code can use count and distinguish 1-arrays from 0-arrays.

Russ

[r, 2014-07-15 21:18:21]

*** Submitted as https://code.google.com/p/go/source/detail?r=acaee74c3fdb ***

cmd/ld: change DWARF encoding for array lengths
They can be large, so use a varint encoding rather than only one byte.

LGTM=iant, rsc
R=rsc, iant
CC=golang-codereviews
https://codereview.appspot.com/113180043