Use unsigned index array accesses for texture sampling.

Array accesses with unsigned indices can be faster on x86-64 because
we can take advantage of implicit zero-extension of 32-bit integers to
64-bit during pointer arithmetic.

Change-Id: I17d531d9ad05c2d2994f007d5444b2a514a591b8
Reviewed-on: https://swiftshader-review.googlesource.com/8571
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
diff --git a/OWNERS b/OWNERS
index 2b1282d..2c51053 100644
--- a/OWNERS
+++ b/OWNERS
@@ -3,5 +3,7 @@
 # This list is used by Chromium to make sure that one of the owners in this
 # list has approved a SwiftShader related change before landing it
 
-sugoi@chromium.org
 capn@chromium.org
+capn@google.com
+sugoi@chromium.org
+sugoi@google.com
\ No newline at end of file