VM: Remove dead code from arm/mips/arm64 call instruction patterns

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 8431674cfa11d66865b13632e1ee2b3ff979dfb0..845d9da9481c3347b311f60b4487788dd9bb9443 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -3628,6 +3628,7 @@ class ObjectPool : public Object {
   // Returns the pool index from the offset relative to a tagged RawObjectPool*,
   // adjusting for the tag-bit.
   static intptr_t IndexFromOffset(intptr_t offset) {
+    ASSERT(Utils::IsAligned(offset + kHeapObjectTag, kWordSize));
     return (offset + kHeapObjectTag - data_offset()) / kBytesPerElement;
   }