Couple of fixes to GRAPHITE-OpenCL

[Alexey Kravets]

Hi guys,
These are couple of patches for Graphite-OpenCL.
First patch fixes lack of MINUS_EXPR processing in OpenCL kernel code 
generation.
The second one fixed VEC related issue, which caused ISE on some tests 
from NPB (NASA parallel benchmark).

ChangeLogs:
[1]
        * graphite-opencl-codegen.c (opencl_print_operand):
        Handle MINUS_EXPR in OpenCL kernel code generation.

[2]
        * graphite-opencl.c (opencl_postpass_data): Use correct
        vectors for processing postpass data in opencl_postpass_data

--
Alexey Kravets
mr.kayr...@gmail.com

        * graphite-opencl.c (opencl_postpass_data): Use correct
        vectors for processing postpass data in opencl_postpass_data.

diff --git a/gcc/graphite-opencl.c b/gcc/graphite-opencl.c
index e118d17..7e2dac6 100644
--- a/gcc/graphite-opencl.c
+++ b/gcc/graphite-opencl.c
@@ -1990,16 +1990,13 @@ opencl_postpass_data (opencl_main code_gen, opencl_clast_meta meta)

   if (meta->parent)
     {
-      VEC (opencl_data, heap) *parent_vec_host
-	= meta->parent->post_pass_to_host;
-      VEC (opencl_data, heap) *parent_vec_device
-	= meta->parent->post_pass_to_device;
-
       FOR_EACH_VEC_ELT (opencl_data, meta->post_pass_to_host, i, curr)
-	VEC_safe_push (opencl_data, heap, parent_vec_host, curr);
+	VEC_safe_push (opencl_data, heap, meta->parent->post_pass_to_host,
+                       curr);

       FOR_EACH_VEC_ELT (opencl_data, meta->post_pass_to_device, i, curr)
-	VEC_safe_push (opencl_data, heap, parent_vec_device, curr);
+	VEC_safe_push (opencl_data, heap, meta->parent->post_pass_to_device,
+                       curr);
     }

   VEC_free (opencl_data, heap, meta->post_pass_to_host);
        * graphite-opencl-codegen.c (opencl_print_operand):
        Handle MINUS_EXPR in OpenCL kernel code generation.

diff --git a/gcc/graphite-opencl-codegen.c b/gcc/graphite-opencl-codegen.c
index 450eded..e7a8703 100644
--- a/gcc/graphite-opencl-codegen.c
+++ b/gcc/graphite-opencl-codegen.c
@@ -1146,6 +1146,20 @@ opencl_print_operand (tree node, bool lhs, opencl_main code_gen)
         opencl_append_string_to_body (")", code_gen);
         return 0;
       }
+    case MINUS_EXPR:
+      {
+        if (lhs)
+          return -1;
+
+        opencl_append_string_to_body ("(", code_gen);
+        opencl_print_operand (TREE_OPERAND (node, 0), false, code_gen);
+        opencl_append_string_to_body (" - ", code_gen);
+        opencl_print_operand (TREE_OPERAND (node, 1), false, code_gen);
+        opencl_append_string_to_body (")", code_gen);
+        return 0;
+      }
+
+

     case MULT_EXPR:
       {