Integrate premultiply/unpremultiply operations into libjpeg-turbo....

third_party/libjpeg_turbo/simd/jsimd_i386.c

Index: third_party/libjpeg_turbo/simd/jsimd_i386.c
===================================================================
--- third_party/libjpeg_turbo/simd/jsimd_i386.c	(revision 69212)
+++ third_party/libjpeg_turbo/simd/jsimd_i386.c	(working copy)
@@ -138,6 +138,10 @@
       sse2fct=jsimd_extxrgb_ycc_convert_sse2;
       mmxfct=jsimd_extxrgb_ycc_convert_mmx;
       break;
+    case JCS_EXT_BGRA:
+      sse2fct=jsimd_extbgra_ycc_convert_sse2;
+      mmxfct=jsimd_extbgrx_ycc_convert_mmx;
+      break;
     default:
       sse2fct=jsimd_rgb_ycc_convert_sse2;
       mmxfct=jsimd_rgb_ycc_convert_mmx;
@@ -953,4 +957,3 @@
     jsimd_idct_float_3dnow(compptr->dct_table, coef_block,
         output_buf, output_col);
 }
-