cmd/compile: make -A and -newexport compatible

Packages compiled with -A may reference the builtin "any" type, so it
needs to be included in the list of predeclared types for binary
import/export.

Also, when -A is used, mark all symbols as SymExport instead of
SymPackage in importsym.  This parallels the logic in autoexport and
is necessary to prevent a "export/package mismatch" errors in
exportsym during dumpexport's verifyExport pass.

Change-Id: Iff5ec5fbfe2219525ec9d1a975307fa8936af9b9
Reviewed-on: https://go-review.googlesource.com/19627
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/gc/bexport.go

@@ -1035,6 +1035,9 @@ func predeclared() []*Type {
 
 			// package unsafe
 			Types[TUNSAFEPTR],
+
+			// any type, for builtin export data
+			Types[TANY],
 		}
 	}
 	return predecl

src/cmd/compile/internal/gc/export.go

@@ -442,7 +442,7 @@ func importsym(s *Sym, op Op) *Sym {
 
 	// mark the symbol so it is not reexported
 	if s.Def == nil {
-		if exportname(s.Name) || initname(s.Name) {
+		if Debug['A'] != 0 || exportname(s.Name) || initname(s.Name) {
 			s.Flags |= SymExport
 		} else {
 			s.Flags |= SymPackage // package scope

src/go/internal/gcimporter/bimport.go

@@ -678,4 +678,8 @@ var predeclared = []types.Type{
 
 	// package unsafe
 	types.Typ[types.UnsafePointer],
+
+	// any type, for builtin export data
+	// TODO(mdempsky): Provide an actual Type value to represent "any"?
+	types.Typ[types.Invalid],
 }