Implement crankshaft support for pixel array stores.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index ded42b4b2ece73b907a841540d58665152ec3079..41cdb4c9c73b617a464ded994fb4a8151e2cca03 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -10790,6 +10790,24 @@ THREADED_TEST(PixelArray) {
                       "result");
   CHECK_EQ(32640, result->Int32Value());
 
+  // Make sure that pixel array stores are optimized by crankshaft.
+  result = CompileRun("function pa_init(p) {"
+                      "for (var i = 0; i < 256; ++i) { p[i] = i; }"
+                      "}"
+                      "function pa_load(p) {"
+                      "  var sum = 0;"
+                      "  for (var i=0; i<256; ++i) {"
+                      "    sum += p[i];"
+                      "  }"
+                      "  return sum; "
+                      "}"
+                      "for (var i = 0; i < 100000; ++i) {"
+                      "  pa_init(pixels);"
+                      "}"
+                      "result = pa_load(pixels);"
+                      "result");
+  CHECK_EQ(32640, result->Int32Value());
+
   free(pixel_data);
 }