runtime: TestGdbPython 'print mapvar' should not need unwinding

issue #10017: TestGdbPython 'print mapvar' is reported to fail on ppc64.
issue #10002: TestGdbPython 'print mapvar' is reported to fail on arm hardfloat.

The testcase now uses plain line number in main.  Unwinding issues are
unrelated to the GDB map prettyprinter feature.

Remove arch-specific t.Skip()s from those two issues.

Fixes #10017
Fixes #10002

Change-Id: I9d50ffe2f3eb7bf65dd17c8c76a2677571de68ba
Reviewed-on: https://go-review.googlesource.com/6267Reviewed-by: Minux Ma <minux@golang.org>

src/runtime/runtime-gdb_test.go

@@ -9,7 +9,6 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
-	"strings"
 	"testing"
 )
 
@@ -28,14 +27,11 @@ func checkGdbPython(t *testing.T) {
 const helloSource = `
 package main
 import "fmt"
-func finish() {
-	fmt.Println("hi")
-}
 func main() {
 	mapvar := make(map[string]string,5)
 	mapvar["abc"] = "def"
 	mapvar["ghi"] = "jkl"
-	finish()
+	fmt.Println("hi") // line 8
 }
 `
 
@@ -43,13 +39,6 @@ func TestGdbPython(t *testing.T) {
 	if runtime.GOOS == "darwin" {
 		t.Skip("gdb does not work on darwin")
 	}
-	if strings.HasPrefix(runtime.GOARCH, "ppc64") {
-		t.Skip("gdb does not work on ppc64 - issue 10017")
-	}
-
-	if runtime.GOOS == "linux" && runtime.GOARCH == "arm" {
-		t.Skip("issue 10002")
-	}
 
 	checkGdbPython(t)
 
@@ -74,9 +63,8 @@ func TestGdbPython(t *testing.T) {
 
 	got, _ := exec.Command("gdb", "-nx", "-q", "--batch", "-iex",
 		fmt.Sprintf("add-auto-load-safe-path %s/src/runtime", runtime.GOROOT()),
-		"-ex", "br 'main.finish'",
+		"-ex", "br main.go:8",
 		"-ex", "run",
-		"-ex", "up",
 		"-ex", "echo BEGIN info goroutines\n",
 		"-ex", "info goroutines",
 		"-ex", "echo END\n",