[AArch64] Add ARMv8.3 instructions which are in the NOP space

This patch adds support for a subset of the ARMv8.3 pointer authentication
instructions: XPACLRI, PACIA1716, PACIB1716, AUTIA1716, AUTIA1716, PACIAZ,
PACIASP, PACIBZ, PACISP, AUTIAZ, AUTIASP, AUTIBZ, AUTIBSP.

These are aliases to HINT #0x7, HINT #0x8, HINT #0xa, HINT #0xc, HINT #0xe,
HINT #0x18, HINT #0x19, ..., HINT #0x1f respectively.

For more details about pointer authentication in ARMv8.3 see
https://community.arm.com/groups/processors/blog/2016/10/27/armv8-a-architecture-2016-additions

opcodes/
2016-11-11  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* aarch64-tbl.h (aarch64_feature_v8_3, ARMV8_3, V8_3_INSN): New.
	(arch64_opcode_table): Add xpaclri, pacia1716, pacib1716, autia1716,
	autib1716, paciaz, paciasp, pacibz, pacibsp, autiaz, autiasp, autibz,
	autibsp.
	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Regenerate.

gas/
2016-11-11  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* testsuite/gas/aarch64/system-3.s: New.
	* testsuite/gas/aarch64/system-3.d: New.
	* testsuite/gas/aarch64/system.d: Update expected output.

4 files changed, 94 insertions, 13 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 6c0d24f..1caf7a1 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,11 @@
 2016-11-11  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
+	* testsuite/gas/aarch64/system-3.s: New.
+	* testsuite/gas/aarch64/system-3.d: New.
+	* testsuite/gas/aarch64/system.d: Update expected output.
+
+2016-11-11  Szabolcs Nagy  <szabolcs.nagy@arm.com>
+
 	* config/tc-aarch64.c (aarch64_archs): Add "armv8.3-a".
 	* doc/c-aarch64.texi (-march): Likewise.
 
diff --git a/gas/testsuite/gas/aarch64/system-3.d b/gas/testsuite/gas/aarch64/system-3.d
new file mode 100644
index 0000000..f1db369
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/system-3.d
@@ -0,0 +1,34 @@
+#as: -march=armv8.3-a
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0000000000000000 <.*>:
+   0:	d50320ff 	xpaclri
+   4:	d50320ff 	xpaclri
+   8:	d503211f 	pacia1716
+   c:	d503211f 	pacia1716
+  10:	d503215f 	pacib1716
+  14:	d503215f 	pacib1716
+  18:	d503219f 	autia1716
+  1c:	d503219f 	autia1716
+  20:	d50321df 	autib1716
+  24:	d50321df 	autib1716
+  28:	d503231f 	paciaz
+  2c:	d503231f 	paciaz
+  30:	d503233f 	paciasp
+  34:	d503233f 	paciasp
+  38:	d503235f 	pacibz
+  3c:	d503235f 	pacibz
+  40:	d503237f 	pacibsp
+  44:	d503237f 	pacibsp
+  48:	d503239f 	autiaz
+  4c:	d503239f 	autiaz
+  50:	d50323bf 	autiasp
+  54:	d50323bf 	autiasp
+  58:	d50323df 	autibz
+  5c:	d50323df 	autibz
+  60:	d50323ff 	autibsp
+  64:	d50323ff 	autibsp
diff --git a/gas/testsuite/gas/aarch64/system-3.s b/gas/testsuite/gas/aarch64/system-3.s
new file mode 100644
index 0000000..c68b4a8
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/system-3.s
@@ -0,0 +1,41 @@
+	/* ARMv8.3 Pointer authentication, HINT alias instructions.  */
+	.text
+
+	xpaclri
+	hint #0x7
+
+	pacia1716
+	hint #0x8
+
+	pacib1716
+	hint #0xa
+
+	autia1716
+	hint #0xc
+
+	autib1716
+	hint #0xe
+
+	paciaz
+	hint #0x18
+
+	paciasp
+	hint #0x19
+
+	pacibz
+	hint #0x1a
+
+	pacibsp
+	hint #0x1b
+
+	autiaz
+	hint #0x1c
+
+	autiasp
+	hint #0x1d
+
+	autibz
+	hint #0x1e
+
+	autibsp
+	hint #0x1f
diff --git a/gas/testsuite/gas/aarch64/system.d b/gas/testsuite/gas/aarch64/system.d
index 2cfcdb5..1103360 100644
--- a/gas/testsuite/gas/aarch64/system.d
+++ b/gas/testsuite/gas/aarch64/system.d
@@ -19,14 +19,14 @@ Disassembly of section \.text:
   2c:	d503209f 	sev
   30:	d50320bf 	sevl
   34:	d50320df 	hint	#0x6
-  38:	d50320ff 	hint	#0x7
-  3c:	d503211f 	hint	#0x8
+  38:	d50320ff 	(hint	#0x7|xpaclri)
+  3c:	d503211f 	(hint	#0x8|pacia1716)
   40:	d503213f 	hint	#0x9
-  44:	d503215f 	hint	#0xa
+  44:	d503215f 	(hint	#0xa|pacib1716)
   48:	d503217f 	hint	#0xb
-  4c:	d503219f 	hint	#0xc
+  4c:	d503219f 	(hint	#0xc|autia1716)
   50:	d50321bf 	hint	#0xd
-  54:	d50321df 	hint	#0xe
+  54:	d50321df 	(hint	#0xe|autib1716)
   58:	d50321ff 	hint	#0xf
   5c:	d503221f 	(hint	#0x10|esb)
   60:	d503223f 	(hint	#0x11|psb	csync)
@@ -36,14 +36,14 @@ Disassembly of section \.text:
   70:	d50322bf 	hint	#0x15
   74:	d50322df 	hint	#0x16
   78:	d50322ff 	hint	#0x17
-  7c:	d503231f 	hint	#0x18
-  80:	d503233f 	hint	#0x19
-  84:	d503235f 	hint	#0x1a
-  88:	d503237f 	hint	#0x1b
-  8c:	d503239f 	hint	#0x1c
-  90:	d50323bf 	hint	#0x1d
-  94:	d50323df 	hint	#0x1e
-  98:	d50323ff 	hint	#0x1f
+  7c:	d503231f 	(hint	#0x18|paciaz)
+  80:	d503233f 	(hint	#0x19|paciasp)
+  84:	d503235f 	(hint	#0x1a|pacibz)
+  88:	d503237f 	(hint	#0x1b|pacibsp)
+  8c:	d503239f 	(hint	#0x1c|autiaz)
+  90:	d50323bf 	(hint	#0x1d|autiasp)
+  94:	d50323df 	(hint	#0x1e|autibz)
+  98:	d50323ff 	(hint	#0x1f|autibsp)
   9c:	d503241f 	hint	#0x20
   a0:	d503243f 	hint	#0x21
   a4:	d503245f 	hint	#0x22