Update from https://crrev.com/312398

third_party/boringssl/linux-aarch64/crypto/modes/ghashv8-armx.S

Index: third_party/boringssl/linux-aarch64/crypto/modes/ghashv8-armx.S
diff --git a/third_party/boringssl/linux-aarch64/crypto/modes/ghashv8-armx.S b/third_party/boringssl/linux-aarch64/crypto/modes/ghashv8-armx.S
new file mode 100644
index 0000000000000000000000000000000000000000..1bfb26340a6e9e49641c6fc5aa006666e8cfd118
--- /dev/null
+++ b/third_party/boringssl/linux-aarch64/crypto/modes/ghashv8-armx.S
@@ -0,0 +1,115 @@
+#include "arm_arch.h"
+
+.text
+.arch	armv8-a+crypto
+.global	gcm_init_v8
+.type	gcm_init_v8,%function
+.align	4
+gcm_init_v8:
+	ld1		{v17.2d},[x1]		//load H
+	movi		v16.16b,#0xe1
+	ext		v3.16b,v17.16b,v17.16b,#8
+	shl	v16.2d,v16.2d,#57
+	ushr	v18.2d,v16.2d,#63
+	ext		v16.16b,v18.16b,v16.16b,#8		//t0=0xc2....01
+	dup		v17.4s,v17.s[1]
+	ushr	v19.2d,v3.2d,#63
+	sshr	v17.4s,v17.4s,#31		//broadcast carry bit
+	and		v19.16b,v19.16b,v16.16b
+	shl	v3.2d,v3.2d,#1
+	ext		v19.16b,v19.16b,v19.16b,#8
+	and		v16.16b,v16.16b,v17.16b
+	orr		v3.16b,v3.16b,v19.16b		//H<<<=1
+	eor		v3.16b,v3.16b,v16.16b		//twisted H
+	st1		{v3.2d},[x0]
+
+	ret
+.size	gcm_init_v8,.-gcm_init_v8
+
+.global	gcm_gmult_v8
+.type	gcm_gmult_v8,%function
+.align	4
+gcm_gmult_v8:
+	ld1		{v17.2d},[x0]		//load Xi
+	movi		v19.16b,#0xe1
+	ld1		{v20.2d},[x1]		//load twisted H
+	shl	v19.2d,v19.2d,#57
+#ifndef __ARMEB__
+	rev64	v17.16b,v17.16b
+#endif
+	ext		v21.16b,v20.16b,v20.16b,#8
+	mov		x3,#0
+	ext		v3.16b,v17.16b,v17.16b,#8
+	mov		x12,#0
+	eor		v21.16b,v21.16b,v20.16b		//Karatsuba pre-processing
+	mov		x2,x0
+	b		.Lgmult_v8
+.size	gcm_gmult_v8,.-gcm_gmult_v8
+
+.global	gcm_ghash_v8
+.type	gcm_ghash_v8,%function
+.align	4
+gcm_ghash_v8:
+	ld1		{v0.2d},[x0]		//load [rotated] Xi
+	subs		x3,x3,#16
+	movi		v19.16b,#0xe1
+	mov		x12,#16
+	ld1		{v20.2d},[x1]		//load twisted H
+	csel	x12,xzr,x12,eq
+	ext		v0.16b,v0.16b,v0.16b,#8
+	shl	v19.2d,v19.2d,#57
+	ld1		{v17.2d},[x2],x12	//load [rotated] inp
+	ext		v21.16b,v20.16b,v20.16b,#8
+#ifndef __ARMEB__
+	rev64	v0.16b,v0.16b
+	rev64	v17.16b,v17.16b
+#endif
+	eor		v21.16b,v21.16b,v20.16b		//Karatsuba pre-processing
+	ext		v3.16b,v17.16b,v17.16b,#8
+	b		.Loop_v8
+
+.align	4
+.Loop_v8:
+	ext		v18.16b,v0.16b,v0.16b,#8
+	eor		v3.16b,v3.16b,v0.16b		//inp^=Xi
+	eor		v17.16b,v17.16b,v18.16b		//v17.16b is rotated inp^Xi
+
+.Lgmult_v8:
+	pmull	v0.1q,v20.1d,v3.1d		//H.lo·Xi.lo
+	eor		v17.16b,v17.16b,v3.16b		//Karatsuba pre-processing
+	pmull2	v2.1q,v20.2d,v3.2d		//H.hi·Xi.hi
+	subs		x3,x3,#16
+	pmull	v1.1q,v21.1d,v17.1d		//(H.lo+H.hi)·(Xi.lo+Xi.hi)
+	csel	x12,xzr,x12,eq
+
+	ext		v17.16b,v0.16b,v2.16b,#8		//Karatsuba post-processing
+	eor		v18.16b,v0.16b,v2.16b
+	eor		v1.16b,v1.16b,v17.16b
+	 ld1	{v17.2d},[x2],x12	//load [rotated] inp
+	eor		v1.16b,v1.16b,v18.16b
+	pmull	v18.1q,v0.1d,v19.1d		//1st phase
+
+	ins	v2.d[0],v1.d[1]
+	ins	v1.d[1],v0.d[0]
+#ifndef __ARMEB__
+	 rev64	v17.16b,v17.16b
+#endif
+	eor		v0.16b,v1.16b,v18.16b
+	 ext		v3.16b,v17.16b,v17.16b,#8
+
+	ext		v18.16b,v0.16b,v0.16b,#8		//2nd phase
+	pmull	v0.1q,v0.1d,v19.1d
+	eor		v18.16b,v18.16b,v2.16b
+	eor		v0.16b,v0.16b,v18.16b
+	b.hs		.Loop_v8
+
+#ifndef __ARMEB__
+	rev64	v0.16b,v0.16b
+#endif
+	ext		v0.16b,v0.16b,v0.16b,#8
+	st1		{v0.2d},[x0]		//write out Xi
+
+	ret
+.size	gcm_ghash_v8,.-gcm_ghash_v8
+.asciz  "GHASH for ARMv8, CRYPTOGAMS by <appro@openssl.org>"
+.align  2