Merge GDB 7.5.1

gdb/testsuite/gdb.go/chan.go

+package main
+
+import "fmt"
+
+func generate() chan int {
+    ch := make(chan int)
+    go func() {
+        for i := 0; ; i++ {
+            ch <- i // set breakpoint 1 here
+        }
+    }()
+    return ch
+}
+
+func main() {
+    integers := generate()
+    for i := 0; i < 100; i++ { // Print the first hundred integers.
+        fmt.Println(<-integers) // set breakpoint 2 here
+    }
+}