Rename ObjPtr::Decode to ObjPtr::Ptr

Done to prevent ambiguity with ScopedObjectAccess::Decode.

Bug: 31113334

Test: test-art-host
Change-Id: I07a2497cc9cf66386311798933547471987fc316
diff --git a/runtime/native/dalvik_system_VMRuntime.cc b/runtime/native/dalvik_system_VMRuntime.cc
index c7fb44ec..e458e2d 100644
--- a/runtime/native/dalvik_system_VMRuntime.cc
+++ b/runtime/native/dalvik_system_VMRuntime.cc
@@ -74,7 +74,7 @@
     ThrowNegativeArraySizeException(length);
     return nullptr;
   }
-  mirror::Class* element_class = soa.Decode<mirror::Class>(javaElementClass).Decode();
+  mirror::Class* element_class = soa.Decode<mirror::Class>(javaElementClass).Ptr();
   if (UNLIKELY(element_class == nullptr)) {
     ThrowNullPointerException("element class == null");
     return nullptr;
@@ -99,7 +99,7 @@
     ThrowNegativeArraySizeException(length);
     return nullptr;
   }
-  mirror::Class* element_class = soa.Decode<mirror::Class>(javaElementClass).Decode();
+  mirror::Class* element_class = soa.Decode<mirror::Class>(javaElementClass).Ptr();
   if (UNLIKELY(element_class == nullptr)) {
     ThrowNullPointerException("element class == null");
     return nullptr;
@@ -127,7 +127,7 @@
     ThrowIllegalArgumentException("not an array");
     return 0;
   }
-  if (Runtime::Current()->GetHeap()->IsMovableObject(array.Decode())) {
+  if (Runtime::Current()->GetHeap()->IsMovableObject(array.Ptr())) {
     ThrowRuntimeException("Trying to get address of movable array object");
     return 0;
   }