cmd/compile: do not emit an extra debug_line entry for the end of seq addr

Uses DW_LNS_advance_pc directly, instead of calling putpclcdelta
because the latter will create a new debug_line entry for the end of
sequence address.

Fixes #42484

Change-Id: Ib6355605cac101b9bf37a3b4961ab0cee678a839
Reviewed-on: https://go-review.googlesource.com/c/go/+/268937
Trust: Than McIntosh <[email protected]>
Run-TryBot: Than McIntosh <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
Reviewed-by: Cherry Zhang <[email protected]>

Author: aarzilli

src/cmd/internal/obj/dwarf.go

@@ -104,7 +104,8 @@ func (ctxt *Link) generateDebugLinesSymbol(s, lines *LSym) {
 	// GDB will assign a line number of zero the last row in the line
 	// table, which we don't want.
 	lastlen := uint64(s.Size - (lastpc - s.Func().Text.Pc))
-	putpclcdelta(ctxt, dctxt, lines, lastlen, 0)
+	dctxt.AddUint8(lines, dwarf.DW_LNS_advance_pc)
+	dwarf.Uleb128put(dctxt, lines, int64(lastlen))
 	dctxt.AddUint8(lines, 0) // start extended opcode
 	dwarf.Uleb128put(dctxt, lines, 1)
 	dctxt.AddUint8(lines, dwarf.DW_LNE_end_sequence)