Revert "Add consistency CHECKs around ArtMethod fields."

This reverts commit 382df393c684c6a5f3856365177da715880d7f08.

Reason for revert: Fails for test BuzzBeepBlinkTest on x86

Bug: 146765723
Change-Id: If86c07959969a831ab5b24681e70c85d3c59c1fd
Test: TH
diff --git a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
index 5c9d226..e7eff0d 100644
--- a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
@@ -2672,10 +2672,6 @@
   // We arrive here if we have found an implementation, and it is not in the ImtConflictTable.
   // We create a new table with the new pair { interface_method, method }.
   DCHECK(conflict_method->IsRuntimeMethod());
-
-  // Classes in the boot image should never need to update conflict methods in
-  // their IMT.
-  CHECK(!Runtime::Current()->GetHeap()->ObjectIsInBootImageSpace(cls.Get()));
   ArtMethod* new_conflict_method = Runtime::Current()->GetClassLinker()->AddMethodToConflictTable(
       cls.Get(),
       conflict_method,
diff --git a/runtime/jit/jit.cc b/runtime/jit/jit.cc
index 48a51f1..d94e600 100644
--- a/runtime/jit/jit.cc
+++ b/runtime/jit/jit.cc
@@ -1019,10 +1019,6 @@
     // such methods, we need their entrypoints to be stubs that do the
     // initialization check.
     header.VisitPackedArtMethods([&](ArtMethod& method) NO_THREAD_SAFETY_ANALYSIS {
-      // Methods in the boot image should never have their single
-      // implementation flag set (and therefore never have a `data_` pointing
-      // to an ArtMethod for single implementation).
-      CHECK(method.IsIntrinsic() || !method.HasSingleImplementationFlag());
       if (method.IsRuntimeMethod()) {
         return;
       }