internal/syscall/unix: add getrandom syscall for MIPS and SPARC

Reviewed-on: https://go-review.googlesource.com/29678

From-SVN: r240457

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-57bf3f21005c4508003f65207282c057e3526ec0
+28b79f1d5a3a8924329128999a21d0693e08a603
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/internal/syscall/unix/getrandom_linux_mips64x.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build mips64 mips64le
+// +build mips64 mips64le mipsn64 mipso64
 
 package unix
 

libgo/go/internal/syscall/unix/getrandom_linux_mipsn32.go

@@ -0,0 +1,11 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build mipsn32
+
+package unix
+
+// Linux getrandom system call number.
+// See GetRandom in getrandom_linux.go.
+const randomTrap uintptr = 6317

libgo/go/internal/syscall/unix/getrandom_linux_mipso32.go

@@ -0,0 +1,11 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build mipso32
+
+package unix
+
+// Linux getrandom system call number.
+// See GetRandom in getrandom_linux.go.
+const randomTrap uintptr = 4353

libgo/go/internal/syscall/unix/getrandom_linux_sparc.go

@@ -0,0 +1,11 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build sparc sparc64
+
+package unix
+
+// Linux getrandom system call number.
+// See GetRandom in getrandom_linux.go.
+const randomTrap uintptr = 347