Implement in-heap backing store for typed arrays.

src/elements-kind.cc

Index: src/elements-kind.cc
diff --git a/src/elements-kind.cc b/src/elements-kind.cc
index 689c2205696689e82dd45bfb6a67d92a8c3f5099..ebb4616e9229d2ec5322a7b08f105112507c2b0f 100644
--- a/src/elements-kind.cc
+++ b/src/elements-kind.cc
@@ -40,17 +40,26 @@ int ElementsKindToShiftSize(ElementsKind elements_kind) {
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_PIXEL_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
+    case UINT8_ELEMENTS:
+    case INT8_ELEMENTS:
+    case UINT8_CLAMPED_ELEMENTS:
       return 0;
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
+    case UINT16_ELEMENTS:
+    case INT16_ELEMENTS:
       return 1;
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS:
+    case UINT32_ELEMENTS:
+    case INT32_ELEMENTS:
+    case FLOAT32_ELEMENTS:
       return 2;
     case EXTERNAL_DOUBLE_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
     case FAST_HOLEY_DOUBLE_ELEMENTS:
+    case FLOAT64_ELEMENTS:
       return 3;
     case FAST_SMI_ELEMENTS:
     case FAST_ELEMENTS: