cmd/link: fix the size of typerel.* with c-archive buildmode

With buildmode=c-archive, "runtime.types" type isn't STYPE but
STYPERELRO.
On AIX, this symbol is present in the symbol table and not under
typerel.* outersymbol. Therefore, the size of typerel.* must be adapted.

Fixes #35342

Change-Id: Ib982c6557d9b41bc3d8775e4825650897f9e0ee6
Reviewed-on: https://go-review.googlesource.com/c/go/+/205338
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

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

@@ -578,13 +578,14 @@ func xcoffUpdateOuterSize(ctxt *Link, size int64, stype sym.SymKind) {
 		// Nothing to do
 	case sym.STYPERELRO:
 		if ctxt.UseRelro() && (ctxt.BuildMode == BuildModeCArchive || ctxt.BuildMode == BuildModeCShared || ctxt.BuildMode == BuildModePIE) {
-			outerSymSize["typerel.*"] = size
+			// runtime.types size must be removed, as it's a real symbol.
+			outerSymSize["typerel.*"] = size - ctxt.Syms.ROLookup("runtime.types", 0).Size
 			return
 		}
 		fallthrough
 	case sym.STYPE:
 		if !ctxt.DynlinkingGo() {
-			// runtime.types size must be removed.
+			// runtime.types size must be removed, as it's a real symbol.
 			outerSymSize["type.*"] = size - ctxt.Syms.ROLookup("runtime.types", 0).Size
 		}
 	case sym.SGOSTRING: