[Beignet] BUG: Incorrect image write when global work size is an odd multiple of 16

[Dag Lem]

Hi,

If the global work size is an odd multiple of 16, image writes are
garbled in the last work group(s).

The diff below triggers the bug in the compiler_fill_image test.

diff --git a/utests/compiler_fill_image.cpp
b/utests/compiler_fill_image.cpp
index c9242b2..6d29342 100644
--- a/utests/compiler_fill_image.cpp
+++ b/utests/compiler_fill_image.cpp
@@ -2,8 +2,8 @@
 
 static void compiler_fill_image(void)
 {
-  const size_t w = 512;
-  const size_t h = 512;
+  const size_t w = 1*16;
+  const size_t h = 1*16;
   uint32_t color = 0x12345678;
   cl_image_format format;
   cl_image_desc desc;
-- 
Best regards,

Dag Lem