Move mapping table and vmap table offsets to OatMethodHeader.

This change has a libcore/ companion CL
  "Remove ArtMethod's quick fields mapping table and vmap table."
  https://android-review.googlesource.com/91254

Bug: 11767815
Change-Id: I46ce2067e1ecd915da3890606498e31ffc332813
diff --git a/compiler/oat_test.cc b/compiler/oat_test.cc
index 766ef7b..b5d3923 100644
--- a/compiler/oat_test.cc
+++ b/compiler/oat_test.cc
@@ -176,7 +176,8 @@
   // If this test is failing and you have to update these constants,
   // it is time to update OatHeader::kOatVersion
   EXPECT_EQ(80U, sizeof(OatHeader));
-  EXPECT_EQ(28U, sizeof(OatMethodOffsets));
+  EXPECT_EQ(20U, sizeof(OatMethodOffsets));
+  EXPECT_EQ(12U, sizeof(OatMethodHeader));
 }
 
 TEST_F(OatTest, OatHeaderIsValid) {