[dev.garbage] all: merge dev.cc into dev.garbage

The garbage collector is now written in Go.
There is plenty to clean up (just like on dev.cc).

all.bash passes on darwin/amd64, darwin/386, linux/amd64, linux/386.

TBR=rlh
R=austin, rlh, bradfitz
CC=golang-codereviews
https://golang.org/cl/173250043

1 files changed, 10 insertions, 4 deletions

diff --git a/src/runtime/string.go b/src/runtime/string.go
index 882281605a..e01bc3b846 100644
--- a/src/runtime/string.go
+++ b/src/runtime/string.go
@@ -221,7 +221,7 @@ func rawbyteslice(size int) (b []byte) {
 
 // rawruneslice allocates a new rune slice. The rune slice is not zeroed.
 func rawruneslice(size int) (b []rune) {
-	if uintptr(size) > maxmem/4 {
+	if uintptr(size) > _MaxMem/4 {
 		gothrow("out of memory")
 	}
 	mem := goroundupsize(uintptr(size) * 4)
@@ -251,9 +251,6 @@ func gostringsize(n int) string {
 	return s
 }
 
-//go:noescape
-func findnull(*byte) int
-
 func gostring(p *byte) string {
 	l := findnull(p)
 	if l == 0 {
@@ -292,3 +289,12 @@ func contains(s, t string) bool {
 func hasprefix(s, t string) bool {
 	return len(s) >= len(t) && s[:len(t)] == t
 }
+
+func goatoi(s string) int {
+	n := 0
+	for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
+		n = n*10 + int(s[0]) - '0'
+		s = s[1:]
+	}
+	return n
+}