[dev.cc] cmd/dist: build new5a etc during bootstrap

The change to the bootstrap import conversion is
for the a.y files, which use import dot.

While we're editing the tool list, add "cmd/dist".
Right now 'go install cmd/dist' installs to $GOROOT/bin/dist.
(A new bug since cmd/dist has been rewritten in Go.
When cmd/dist was a C program, go install cmd/dist just didn't work.)

Change-Id: I362208dcfb4ae64c987f60b95dc946829fa506d8
Reviewed-on: https://go-review.googlesource.com/3144Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

src/cmd/dist/buildtool.go

@@ -23,11 +23,16 @@ import (
 // which are commands, and entries beginning with internal/, which are
 // packages supporting the commands.
 var bootstrapDirs = []string{
+	"internal/asm",
 	"internal/obj",
 	"internal/obj/arm",
 	"internal/obj/i386",
 	"internal/obj/ppc64",
 	"internal/obj/x86",
+	"new5a",
+	"new6a",
+	"new8a",
+	"new9a",
 	"objwriter",
 }
 
@@ -112,7 +117,8 @@ func bootstrapFixImports(text, srcFile string) string {
 			inBlock = false
 			continue
 		}
-		if strings.HasPrefix(line, "import \"") || inBlock && strings.HasPrefix(line, "\t\"") {
+		if strings.HasPrefix(line, `import "`) || strings.HasPrefix(line, `import . "`) ||
+			inBlock && (strings.HasPrefix(line, "\t\"") || strings.HasPrefix(line, "\t. \"")) {
 			lines[i] = strings.Replace(line, `"cmd/internal/`, `"bootstrap/internal/`, -1)
 		}
 	}

src/cmd/go/pkg.go

@@ -394,6 +394,7 @@ var goTools = map[string]targetDir{
 	"cmd/addr2line":                        toTool,
 	"cmd/api":                              toTool,
 	"cmd/cgo":                              toTool,
+	"cmd/dist":                             toTool,
 	"cmd/fix":                              toTool,
 	"cmd/link":                             toTool,
 	"cmd/new5a":                            toTool,