ART: Use reinterpret_cast{32,64}<> when appropriate.

And fix UnstartedRuntime checking for null arguments in all
functions where we now use reinterpret_cast32<>.

This is a follow-up to
    https://android-review.googlesource.com/783607 .

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: Pixel 2 XL boots.
Test: m test-art-target-gtest
Test: testrunner.py --target --optimizing
Bug: 117427174
Change-Id: I58f8ad59f70e3fbb1d06aef419cd26555706fa65
diff --git a/runtime/runtime-inl.h b/runtime/runtime-inl.h
index 374591e..bde0d11 100644
--- a/runtime/runtime-inl.h
+++ b/runtime/runtime-inl.h
@@ -22,6 +22,7 @@
 #include "arch/instruction_set.h"
 #include "art_method.h"
 #include "base/callee_save_type.h"
+#include "base/casts.h"
 #include "entrypoints/quick/callee_save_frame.h"
 #include "gc_root-inl.h"
 #include "obj_ptr-inl.h"
@@ -82,7 +83,7 @@
 
 inline ArtMethod* Runtime::GetCalleeSaveMethodUnchecked(CalleeSaveType type)
     REQUIRES_SHARED(Locks::mutator_lock_) {
-  return reinterpret_cast<ArtMethod*>(callee_save_methods_[static_cast<size_t>(type)]);
+  return reinterpret_cast64<ArtMethod*>(callee_save_methods_[static_cast<size_t>(type)]);
 }
 
 }  // namespace art