runtime: aeshash stubs for arm64

For some reason the absense of an implementation does not stop arm64
binaries being built. However it comes up with -buildmode=c-archive.

Change-Id: Ic0db5fd8fb4fe8252b5aa320818df0c7aec3db8f
Reviewed-on: https://go-review.googlesource.com/8989Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/asm_arm64.s

@@ -469,6 +469,20 @@ TEXT runtime·atomicloaduint(SB), NOSPLIT, $-8-16
 TEXT runtime·atomicstoreuintptr(SB), NOSPLIT, $0-16
 	B	runtime·atomicstore64(SB)
 
+// AES hashing not implemented for ARM64, issue #10109.
+TEXT runtime·aeshash(SB),NOSPLIT,$-8-0
+	MOVW	$0, R0
+	MOVW	(R0), R1
+TEXT runtime·aeshash32(SB),NOSPLIT,$-8-0
+	MOVW	$0, R0
+	MOVW	(R0), R1
+TEXT runtime·aeshash64(SB),NOSPLIT,$-8-0
+	MOVW	$0, R0
+	MOVW	(R0), R1
+TEXT runtime·aeshashstr(SB),NOSPLIT,$-8-0
+	MOVW	$0, R0
+	MOVW	(R0), R1
+
 // bool casp(void **val, void *old, void *new)
 // Atomically:
 //	if(*val == old){