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Add Neon intrinsic vp9_fdct8x8_quant_neon

On Nexus 7 speed -5 got ~2%, -6 got ~15%, -7 and -8 got ~30%
increase in perf.

Tested on Nexus 7, built with ndk r10d, gcc 4.9.

Change-Id: I83246d63b96674d170098a572fa4fe28a05aaf51

--- a/vp9/common/vp9_rtcd_defs.pl

+++ b/vp9/common/vp9_rtcd_defs.pl

@@ -1166,7 +1166,7 @@

   specialize qw/vp9_quantize_b_32x32/, "$ssse3_x86_64";

   add_proto qw/void vp9_fdct8x8_quant/, "const int16_t *input, int stride, tran_low_t *coeff_ptr, intptr_t n_coeffs, int skip_block, const int16_t *zbin_ptr, const int16_t *round_ptr, const int16_t *quant_ptr, const int16_t *quant_shift_ptr, tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr, uint16_t *eob_ptr, const int16_t *scan, const int16_t *iscan";

-  specialize qw/vp9_fdct8x8_quant sse2 ssse3/;

+  specialize qw/vp9_fdct8x8_quant sse2 ssse3 neon/;

 }

 #

--- a/vp9/encoder/arm/neon/vp9_dct_neon.c

+++ b/vp9/encoder/arm/neon/vp9_dct_neon.c

@@ -32,6 +32,24 @@

   }

 }

+void vp9_fdct8x8_quant_neon(const int16_t *input, int stride,

+                            int16_t* coeff_ptr, intptr_t n_coeffs,

+                            int skip_block, const int16_t* zbin_ptr,

+                            const int16_t* round_ptr, const int16_t* quant_ptr,

+                            const int16_t* quant_shift_ptr,

+                            int16_t* qcoeff_ptr, int16_t* dqcoeff_ptr,

+                            const int16_t* dequant_ptr, uint16_t* eob_ptr,

+                            const int16_t* scan_ptr,

+                            const int16_t* iscan_ptr) {

+  int16_t temp_buffer[64];

+  (void)coeff_ptr;

+

+  vp9_fdct8x8_neon(input, temp_buffer, stride);

+  vp9_quantize_fp_neon(temp_buffer, n_coeffs, skip_block, zbin_ptr, round_ptr,

+                       quant_ptr, quant_shift_ptr, qcoeff_ptr, dqcoeff_ptr,

+                       dequant_ptr, eob_ptr, scan_ptr, iscan_ptr);

+}

+

 void vp9_fdct8x8_neon(const int16_t *input, int16_t *final_output, int stride) {

   int i;

   // stage 1