go/build, runtime/internal/sys: add GOOS=aix

This is the first commit of a series that will add AIX as an
operating system target for ppc64 architecture.

Updates #25893

Change-Id: I865b67a9c98277c11c1a56107be404ac5253277d
Reviewed-on: https://go-review.googlesource.com/138115
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/go/build/syslist.go

@@ -4,5 +4,5 @@
 
 package build
 
-const goosList = "android darwin dragonfly freebsd js linux nacl netbsd openbsd plan9 solaris windows zos "
+const goosList = "aix android darwin dragonfly freebsd js linux nacl netbsd openbsd plan9 solaris windows zos "
 const goarchList = "386 amd64 amd64p32 arm armbe arm64 arm64be ppc64 ppc64le mips mipsle mips64 mips64le mips64p32 mips64p32le ppc riscv riscv64 s390 s390x sparc sparc64 wasm "

src/runtime/internal/sys/zgoos_aix.go

+// Code generated by gengoos.go using 'go generate'. DO NOT EDIT.
+
+// +build aix
+
+package sys
+
+const GOOS = `aix`
+
+const GoosAndroid = 0
+const GoosAix = 1
+const GoosDarwin = 0
+const GoosDragonfly = 0
+const GoosFreebsd = 0
+const GoosLinux = 0
+const GoosNacl = 0
+const GoosNetbsd = 0
+const GoosOpenbsd = 0
+const GoosPlan9 = 0
+const GoosSolaris = 0
+const GoosWindows = 0
+const GoosZos = 0

src/runtime/internal/sys/zgoos_android.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `android`
 
 const GoosAndroid = 1
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_darwin.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `darwin`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 1
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_dragonfly.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `dragonfly`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 1
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_freebsd.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `freebsd`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 1

src/runtime/internal/sys/zgoos_linux.go

@@ -8,6 +8,7 @@ package sys
 const GOOS = `linux`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_nacl.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `nacl`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_netbsd.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `netbsd`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_openbsd.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `openbsd`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_plan9.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `plan9`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_solaris.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `solaris`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_windows.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `windows`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0

src/runtime/internal/sys/zgoos_zos.go

@@ -7,6 +7,7 @@ package sys
 const GOOS = `zos`
 
 const GoosAndroid = 0
+const GoosAix = 0
 const GoosDarwin = 0
 const GoosDragonfly = 0
 const GoosFreebsd = 0