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Than McIntosh fd4631e24f cmd/compile/internal/dwarfgen: fix DWARF param DIE ordering
The DWARF standard requires that the DIEs in a subprogram
corresponding to input and output parameters appear in declaration
order; this patch adds some new code in dwarfgen to enforce this
ordering (relying on the existing fn.Dcl ordering is not sufficient).

Prior to the register ABI, it was easy to keep vars/decls sorted
during DWARF generation since you could always rely on frame offset;
with the ABI sorting by frame offset no longer gives you the original
declaration order in all cases.

Fixes #46055.

Change-Id: I0e070cb781d6453caba896e5d3bee7cd5388050d
Reviewed-on: https://go-review.googlesource.com/c/go/+/318829
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2021-05-13 14:30:42 +00:00
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