[dev.link] cmd/link: stop marking DWARF constant symbols

DWARF constant symbols were always marked and converted to
sym.Symbols when DWARF generation uses sym.Symbols. Now that the
DWARF generation uses the loader, no need to force-mark them.

Change-Id: Ia4032430697cfa901fb4b6d106a483973277ea0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/226803
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>

diff --git a/src/cmd/link/internal/ld/deadcode2.go b/src/cmd/link/internal/ld/deadcode2.go
index 59f207b278f1a9e48dd9714ea2927eb17e15e4df..3342efe39f88ff630478eb6bb7a9eeea62e6ee5b 100644 (file)
--- a/src/cmd/link/internal/ld/deadcode2.go
+++ b/src/cmd/link/internal/ld/deadcode2.go
@@ -6,7 +6,6 @@ package ld
 
 import (
        "bytes"
-       "cmd/internal/dwarf"
        "cmd/internal/objabi"
        "cmd/internal/sys"
        "cmd/link/internal/loader"
@@ -101,14 +100,6 @@ func (d *deadcodePass2) init() {
                names = append(names, exp)
        }
 
-       // DWARF constant DIE symbols are not referenced, but needed by
-       // the dwarf pass.
-       if !*FlagW {
-               for _, lib := range d.ctxt.Library {
-                       names = append(names, dwarf.ConstInfoPrefix+lib.Pkg)
-               }
-       }
-
        for _, name := range names {
                // Mark symbol as a data/ABI0 symbol.
                d.mark(d.ldr.Lookup(name, 0), 0)