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Add macros for the non-standard mov.16b/mov.8b/ext.16b/ext.8b

This fixes building with gnu binutils, which don't support this
nonstandard form of the instructions.

Once Apple's tools support the proper standard form of the
instructions, the code should be updated to use that everywhere
instead, and these macros should be removed.

--- a/codec/common/arm64/arm_arch64_common_macro.S

+++ b/codec/common/arm64/arm_arch64_common_macro.S

@@ -58,4 +58,20 @@

 ret

 .endfunc

 .endm

+

+.macro mov.16b arg0, arg1

+    mov \arg0\().16b, \arg1\().16b

+.endm

+

+.macro mov.8b arg0, arg1

+    mov \arg0\().8b, \arg1\().8b

+.endm

+

+.macro ext.16b arg0, arg1, arg2, arg3

+    ext \arg0\().16b, \arg1\().16b, \arg2\().16b, \arg3

+.endm

+

+.macro ext.8b arg0, arg1, arg2, arg3

+    ext \arg0\().8b, \arg1\().8b, \arg2\().8b, \arg3

+.endm

 #endif