libgo: update to Go 1.8 release candidate 1

Compiler changes:
      * Change map assignment to use mapassign and assign value directly.
      * Change string iteration to use decoderune, faster for ASCII strings.
      * Change makeslice to take int, and use makeslice64 for larger values.
      * Add new noverflow field to hmap struct used for maps.
    
    Unresolved problems, to be fixed later:
      * Commented out test in go/types/sizes_test.go that doesn't compile.
      * Commented out reflect.TestStructOf test for padding after zero-sized field.
    
    Reviewed-on: https://go-review.googlesource.com/35231

gotools/:
	Updates for Go 1.8rc1.
	* Makefile.am (go_cmd_go_files): Add bug.go.
	(s-zdefaultcc): Write defaultPkgConfig.
	* Makefile.in: Rebuild.

From-SVN: r244456

libgo/go/runtime/string_test.go

@@ -5,6 +5,7 @@
 package runtime_test
 
 import (
+	"runtime"
 	"strings"
 	"testing"
 )
@@ -81,28 +82,50 @@ func BenchmarkCompareStringBig(b *testing.B) {
 	b.SetBytes(int64(len(s1)))
 }
 
-func BenchmarkRuneIterate(b *testing.B) {
-	bytes := make([]byte, 100)
-	for i := range bytes {
-		bytes[i] = byte('A')
-	}
-	s := string(bytes)
+func BenchmarkConcatStringAndBytes(b *testing.B) {
+	s1 := []byte("Gophers!")
 	for i := 0; i < b.N; i++ {
-		for range s {
-		}
+		_ = "Hello " + string(s1)
 	}
 }
 
-func BenchmarkRuneIterate2(b *testing.B) {
-	bytes := make([]byte, 100)
-	for i := range bytes {
-		bytes[i] = byte('A')
-	}
-	s := string(bytes)
-	for i := 0; i < b.N; i++ {
-		for range s {
+var stringdata = []struct{ name, data string }{
+	{"ASCII", "01234567890"},
+	{"Japanese", "日本語日本語日本語"},
+	{"MixedLength", "$Ѐࠀက퀀𐀀\U00040000\U0010FFFF"},
+}
+
+func BenchmarkRuneIterate(b *testing.B) {
+	b.Run("range", func(b *testing.B) {
+		for _, sd := range stringdata {
+			b.Run(sd.name, func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for range sd.data {
+					}
+				}
+			})
 		}
-	}
+	})
+	b.Run("range1", func(b *testing.B) {
+		for _, sd := range stringdata {
+			b.Run(sd.name, func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for _ = range sd.data {
+					}
+				}
+			})
+		}
+	})
+	b.Run("range2", func(b *testing.B) {
+		for _, sd := range stringdata {
+			b.Run(sd.name, func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for _, _ = range sd.data {
+					}
+				}
+			})
+		}
+	})
 }
 
 func BenchmarkArrayEqual(b *testing.B) {
@@ -149,21 +172,6 @@ func TestLargeStringConcat(t *testing.T) {
 	}
 }
 
-/*
-func TestGostringnocopy(t *testing.T) {
-	max := *runtime.Maxstring
-	b := make([]byte, max+10)
-	for i := uintptr(0); i < max+9; i++ {
-		b[i] = 'a'
-	}
-	_ = runtime.Gostringnocopy(&b[0])
-	newmax := *runtime.Maxstring
-	if newmax != max+9 {
-		t.Errorf("want %d, got %d", max+9, newmax)
-	}
-}
-*/
-
 func TestCompareTempString(t *testing.T) {
 	s := strings.Repeat("x", sizeNoStack)
 	b := []byte(s)
@@ -277,3 +285,97 @@ func TestString2Slice(t *testing.T) {
 		t.Errorf("extra runes not zeroed")
 	}
 }
+
+const intSize = 32 << (^uint(0) >> 63)
+
+type atoi64Test struct {
+	in  string
+	out int64
+	ok  bool
+}
+
+var atoi64tests = []atoi64Test{
+	{"", 0, false},
+	{"0", 0, true},
+	{"-0", 0, true},
+	{"1", 1, true},
+	{"-1", -1, true},
+	{"12345", 12345, true},
+	{"-12345", -12345, true},
+	{"012345", 12345, true},
+	{"-012345", -12345, true},
+	{"12345x", 0, false},
+	{"-12345x", 0, false},
+	{"98765432100", 98765432100, true},
+	{"-98765432100", -98765432100, true},
+	{"20496382327982653440", 0, false},
+	{"-20496382327982653440", 0, false},
+	{"9223372036854775807", 1<<63 - 1, true},
+	{"-9223372036854775807", -(1<<63 - 1), true},
+	{"9223372036854775808", 0, false},
+	{"-9223372036854775808", -1 << 63, true},
+	{"9223372036854775809", 0, false},
+	{"-9223372036854775809", 0, false},
+}
+
+func TestAtoi(t *testing.T) {
+	switch intSize {
+	case 32:
+		for i := range atoi32tests {
+			test := &atoi32tests[i]
+			out, ok := runtime.Atoi(test.in)
+			if test.out != int32(out) || test.ok != ok {
+				t.Errorf("atoi(%q) = (%v, %v) want (%v, %v)",
+					test.in, out, ok, test.out, test.ok)
+			}
+		}
+	case 64:
+		for i := range atoi64tests {
+			test := &atoi64tests[i]
+			out, ok := runtime.Atoi(test.in)
+			if test.out != int64(out) || test.ok != ok {
+				t.Errorf("atoi(%q) = (%v, %v) want (%v, %v)",
+					test.in, out, ok, test.out, test.ok)
+			}
+		}
+	}
+}
+
+type atoi32Test struct {
+	in  string
+	out int32
+	ok  bool
+}
+
+var atoi32tests = []atoi32Test{
+	{"", 0, false},
+	{"0", 0, true},
+	{"-0", 0, true},
+	{"1", 1, true},
+	{"-1", -1, true},
+	{"12345", 12345, true},
+	{"-12345", -12345, true},
+	{"012345", 12345, true},
+	{"-012345", -12345, true},
+	{"12345x", 0, false},
+	{"-12345x", 0, false},
+	{"987654321", 987654321, true},
+	{"-987654321", -987654321, true},
+	{"2147483647", 1<<31 - 1, true},
+	{"-2147483647", -(1<<31 - 1), true},
+	{"2147483648", 0, false},
+	{"-2147483648", -1 << 31, true},
+	{"2147483649", 0, false},
+	{"-2147483649", 0, false},
+}
+
+func TestAtoi32(t *testing.T) {
+	for i := range atoi32tests {
+		test := &atoi32tests[i]
+		out, ok := runtime.Atoi32(test.in)
+		if test.out != out || test.ok != ok {
+			t.Errorf("atoi32(%q) = (%v, %v) want (%v, %v)",
+				test.in, out, ok, test.out, test.ok)
+		}
+	}
+}