[turbofan] Initial support for keyed access to fast JSArrays.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 340954871e758e0ca328ffa38db008a684dd834e..923e5ae11e0128f81ca12417c9796b91dd578aa2 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -692,6 +692,8 @@ source_set("v8_base") {
     "src/compilation-statistics.h",
     "src/compiler/access-builder.cc",
     "src/compiler/access-builder.h",
+    "src/compiler/access-info.cc",
+    "src/compiler/access-info.h",
     "src/compiler/all-nodes.cc",
     "src/compiler/all-nodes.h",
     "src/compiler/ast-graph-builder.cc",
@@ -823,8 +825,6 @@ source_set("v8_base") {
     "src/compiler/pipeline.h",
     "src/compiler/pipeline-statistics.cc",
     "src/compiler/pipeline-statistics.h",
-    "src/compiler/property-access-info.cc",
-    "src/compiler/property-access-info.h",
     "src/compiler/raw-machine-assembler.cc",
     "src/compiler/raw-machine-assembler.h",
     "src/compiler/register-allocator.cc",