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Merge pull request #707 from dongzha/FixIssueMcNEON

Fix potential issue for neon implement on encoder mode decision.

--- a/codec/common/arm/mc_neon.S

+++ b/codec/common/arm/mc_neon.S

@@ -1988,7 +1988,7 @@

 	// horizon filtered

 	UNPACK_2_16BITS_TO_ABC	q10, q11, q9, q12, q13

 	FILTER_3_IN_16BITS_TO_8BITS q9, q12, q13, d10	//output to d10

-	vst1.u8	{d9, d10}, [r2], r3		//write 16Byte

+	vst1.u8	{d9, d10}, [r2]!		//write 16Byte

 	UNPACK_1_IN_8x16BITS_TO_8BITS	d11, d22, d23, q11 //output to d11[0]

 	vst1.u8	{d11[0]}, [r2], r3		//write 16th Byte