Update libjpeg-turbo to v2.0.90 (2.1 beta1)

Update Chromium's copy of libjpeg-turbo to the latest upstream
release (v2.0.90) and re-apply our local changes documented in
README.chromium.

Cherry-pick two additional changes from upstream to fix bugs found
by fuzzers:
1) https://github.com/libjpeg-turbo/libjpeg-turbo/commit/ccaba5d7894ecfb5a8f11e48d3f86e1f14d5a469
2) https://github.com/libjpeg-turbo/libjpeg-turbo/commit/c7ca521bc85b57d41d3ad4963c13fc0100481084

Significant changes provided by this update:
1) A large performance boost to JPEG encoding due to an improved
   Huffman encoding implementation.
2) The complete removal of Arm Neon assembly code. This allows Arm's
   control-flow integrity security features (Armv8.3-A Pointer
   Authentication and Armv8.5-A Branch Target Identification) to be
   switched on with the appropriate compiler flags.

Bug: 922430
Bug: b/135180511
Bug: 919548, 1145581
Change-Id: I319fcdc55b3fd5b219425c07a4e4a03587f4e06d

1 files changed, 9 insertions, 12 deletions

diff --git a/wrtarga.c b/wrtarga.c
index 9dfa920..7a654ff 100644
--- a/wrtarga.c
+++ b/wrtarga.c
@@ -4,7 +4,7 @@
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1996, Thomas G. Lane.
  * libjpeg-turbo Modifications:
- * Copyright (C) 2017, D. R. Commander.
+ * Copyright (C) 2017, 2019, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -102,9 +102,9 @@ put_pixel_rows(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
   inptr = dest->pub.buffer[0];
   outptr = dest->iobuffer;
   for (col = cinfo->output_width; col > 0; col--) {
-    outptr[0] = (char)GETJSAMPLE(inptr[2]); /* RGB to BGR order */
-    outptr[1] = (char)GETJSAMPLE(inptr[1]);
-    outptr[2] = (char)GETJSAMPLE(inptr[0]);
+    outptr[0] = inptr[2]; /* RGB to BGR order */
+    outptr[1] = inptr[1];
+    outptr[2] = inptr[0];
     inptr += 3, outptr += 3;
   }
   (void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
@@ -118,13 +118,10 @@ put_gray_rows(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
   tga_dest_ptr dest = (tga_dest_ptr)dinfo;
   register JSAMPROW inptr;
   register char *outptr;
-  register JDIMENSION col;
 
   inptr = dest->pub.buffer[0];
   outptr = dest->iobuffer;
-  for (col = cinfo->output_width; col > 0; col--) {
-    *outptr++ = (char)GETJSAMPLE(*inptr++);
-  }
+  MEMCOPY(outptr, inptr, cinfo->output_width);
   (void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
 }
 
@@ -147,7 +144,7 @@ put_demapped_gray(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
   inptr = dest->pub.buffer[0];
   outptr = dest->iobuffer;
   for (col = cinfo->output_width; col > 0; col--) {
-    *outptr++ = (char)GETJSAMPLE(color_map0[GETJSAMPLE(*inptr++)]);
+    *outptr++ = color_map0[*inptr++];
   }
   (void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
 }
@@ -182,9 +179,9 @@ start_output_tga(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
       /* Write the colormap.  Note Targa uses BGR byte order */
       outfile = dest->pub.output_file;
       for (i = 0; i < num_colors; i++) {
-        putc(GETJSAMPLE(cinfo->colormap[2][i]), outfile);
-        putc(GETJSAMPLE(cinfo->colormap[1][i]), outfile);
-        putc(GETJSAMPLE(cinfo->colormap[0][i]), outfile);
+        putc(cinfo->colormap[2][i], outfile);
+        putc(cinfo->colormap[1][i], outfile);
+        putc(cinfo->colormap[0][i], outfile);
       }
       dest->pub.put_pixel_rows = put_gray_rows;
     } else {