cmd/link: reorder pe sections

dwarf writing code assumes that dwarf sections follow
.data and .bss, not .ctors. Make pe section writing code
match that assumption.

For #10776.

Change-Id: I128c3ad125f7d0db19e922f165704a054b2af7ba
Reviewed-on: https://go-review.googlesource.com/36980Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/link/internal/ld/pe.go

@@ -1196,14 +1196,16 @@ func Asmbpe(ctxt *Link) {
 		b.Characteristics = IMAGE_SCN_CNT_UNINITIALIZED_DATA | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE | IMAGE_SCN_ALIGN_32BYTES
 		b.PointerToRawData = 0
 		bsssect = pensect
-
-		c = addinitarray(ctxt)
 	}
 
 	if !*FlagS {
 		dwarfaddpeheaders(ctxt)
 	}
 
+	if Linkmode == LinkExternal {
+		c = addinitarray(ctxt)
+	}
+
 	Cseek(int64(nextfileoff))
 	if Linkmode != LinkExternal {
 		addimports(ctxt, d)