[x265] asm: fix dequant_normal

[chen]

It's right, when scale more than 16-bits, it must be in high_bit_depth mode, the lower bits always zero.
please sync the C model code, add some assert() to verify lower bits always zero.

At 2014-08-30 12:39:07,"Satoshi Nakagawa" <nakagawa424 at oki.com> wrote:
># HG changeset patch
># User Satoshi Nakagawa <nakagawa424 at oki.com>
># Date 1409373356 -32400
>#      Sat Aug 30 13:35:56 2014 +0900
># Node ID 9b5f0c75d052e963b0a413f341a74036141b3675
># Parent  4e2d9ac6d489e82e70544d626c89964ee653c452
>asm: fix dequant_normal
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