build: separate compiler and libs

compiler/internal/lib/runtime/runtime2.go

@@ -0,0 +1,13 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime
+
+// Layout of in-memory per-function information prepared by linker
+// See https://golang.org/s/go12symtab.
+// Keep in sync with linker (../cmd/link/internal/ld/pcln.go:/pclntab)
+// and with package debug/gosym and with symtab.go in package runtime.
+type _func struct {
+	unused [8]byte
+}