ART: Fix oat_test for 64b

The QuickEntryPoints structure has a size dependent on the pointer
size.

Change-Id: I369353200430a6ccaccded7589105312fd411b97
diff --git a/compiler/oat_test.cc b/compiler/oat_test.cc
index 558ff1f..ce35d0f 100644
--- a/compiler/oat_test.cc
+++ b/compiler/oat_test.cc
@@ -180,7 +180,7 @@
   EXPECT_EQ(80U, sizeof(OatHeader));
   EXPECT_EQ(8U, sizeof(OatMethodOffsets));
   EXPECT_EQ(24U, sizeof(OatQuickMethodHeader));
-  EXPECT_EQ(320U, sizeof(QuickEntryPoints));
+  EXPECT_EQ(80 * GetInstructionSetPointerSize(kRuntimeISA), sizeof(QuickEntryPoints));
 }
 
 TEST_F(OatTest, OatHeaderIsValid) {