Add per array size allocation entrypoints.

- Update architectures that have fast paths for
  array allocation to use it.
- Will add more fast paths in follow-up CLs.

Test: test-art-target test-art-host.
Change-Id: I138cccd16464a85de22a8ed31c915f876e78fb04
diff --git a/compiler/oat_test.cc b/compiler/oat_test.cc
index 34b33a1..d5842a8 100644
--- a/compiler/oat_test.cc
+++ b/compiler/oat_test.cc
@@ -487,7 +487,7 @@
   EXPECT_EQ(72U, sizeof(OatHeader));
   EXPECT_EQ(4U, sizeof(OatMethodOffsets));
   EXPECT_EQ(20U, sizeof(OatQuickMethodHeader));
-  EXPECT_EQ(157 * static_cast<size_t>(GetInstructionSetPointerSize(kRuntimeISA)),
+  EXPECT_EQ(161 * static_cast<size_t>(GetInstructionSetPointerSize(kRuntimeISA)),
             sizeof(QuickEntryPoints));
 }