syscall: remove ptrace syscall on ppc64

ptrace is available only for 32 bits programs.

Change-Id: Ie0c81b799f5f2c4aae78cd06a34709460529d94f
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/252558
Trust: Than McIntosh <thanm@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

libgo/go/syscall/libcall_aix.go

diff --git a/libgo/go/syscall/libcall_aix.go b/libgo/go/syscall/libcall_aix.go
index 8d9f59e..27b469e 100644
--- a/libgo/go/syscall/libcall_aix.go
+++ b/libgo/go/syscall/libcall_aix.go
@@ -16,9 +16,6 @@
 //sys	Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 //open64at(dirfd _C_int, path *byte, flags _C_int, mode Mode_t) _C_int
 
-//sys	ptrace(request int, id int, addr uintptr, data int, buff uintptr) (val int)
-//ptrace(request _C_int, id int, addr uintptr, data _C_int, buff *byte) _C_int
-
 //sys	ptrace64(request int, id int64, addr int64, data int, buff uintptr) (err error)
 //ptrace64(request _C_int, id int64, addr int64, data _C_int, buff *byte) _C_int
 

libgo/go/syscall/syscall_aix_ppc.go

diff --git a/libgo/go/syscall/syscall_aix_ppc.go b/libgo/go/syscall/syscall_aix_ppc.go
index 83ed1e6..23333e8 100644
--- a/libgo/go/syscall/syscall_aix_ppc.go
+++ b/libgo/go/syscall/syscall_aix_ppc.go
@@ -8,6 +8,9 @@
 
 import "unsafe"
 
+//sys	ptrace(request int, id int, addr uintptr, data int, buff uintptr) (val int)
+//ptrace(request _C_int, id int, addr uintptr, data _C_int, buff *byte) _C_int
+
 // AIX does not define a specific structure but instead uses separate
 // ptrace calls for the different registers.
 type PtraceRegs struct {