Use kPointerSize when cross-compiling. am: b6c230117d

Original change: https://android-review.googlesource.com/c/platform/art/+/2402709

Change-Id: I4dcab75bac8be6b3db7a5dec2c7ab61361251652
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index a2f4513..d5efb68 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -7903,7 +7903,8 @@
       LengthPrefixedArray<ArtMethod>* const new_methods = klass->GetMethodsPtr();
       if (new_methods != nullptr) {
         DCHECK_NE(new_methods->size(), 0u);
-        imt_methods_begin = reinterpret_cast<uintptr_t>(&new_methods->At(0));
+        imt_methods_begin =
+            reinterpret_cast<uintptr_t>(&new_methods->At(0, kMethodSize, kMethodAlignment));
         imt_methods_size = new_methods->size() * kMethodSize;
       }
     }