cmd/internal/sys: add support for GOARCH=mips{,le}

Change-Id: I8c6b8839c68818430510702719dca15b8d748fb8
Reviewed-on: https://go-review.googlesource.com/31473Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/internal/sys/arch.go

@@ -16,6 +16,7 @@ const (
 	ARM
 	ARM64
 	I386
+	MIPS
 	MIPS64
 	PPC64
 	S390X
@@ -97,6 +98,26 @@ var ArchARM64 = &Arch{
 	MinLC:     4,
 }
 
+var ArchMIPS = &Arch{
+	Name:      "mips",
+	Family:    MIPS,
+	ByteOrder: binary.BigEndian,
+	IntSize:   4,
+	PtrSize:   4,
+	RegSize:   4,
+	MinLC:     4,
+}
+
+var ArchMIPSLE = &Arch{
+        Name:      "mipsle",
+        Family:    MIPS,
+        ByteOrder: binary.LittleEndian,
+        IntSize:   4,
+        PtrSize:   4,
+        RegSize:   4,
+        MinLC:     4,
+}
+
 var ArchMIPS64 = &Arch{
 	Name:      "mips64",
 	Family:    MIPS64,
@@ -153,6 +174,8 @@ var Archs = [...]*Arch{
 	ArchAMD64P32,
 	ArchARM,
 	ArchARM64,
+	ArchMIPS,
+	ArchMIPSLE,
 	ArchMIPS64,
 	ArchMIPS64LE,
 	ArchPPC64,