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/interpreter/interpreter_common.cc b/runtime/interpreter/interpreter_common.cc
index 6577726..60c8ef3 100644
--- a/runtime/interpreter/interpreter_common.cc
+++ b/runtime/interpreter/interpreter_common.cc
@@ -18,6 +18,7 @@
 
 #include <cmath>
 
+#include "base/casts.h"
 #include "base/enums.h"
 #include "class_root.h"
 #include "debugger.h"
@@ -584,10 +585,10 @@
   for (uint32_t i = 0, e = shadow_frame->NumberOfVRegs(); i < e; ++i) {
     if (shadow_frame->GetVRegReference(i) == existing) {
       DCHECK_EQ(shadow_frame->GetVRegReference(i),
-                reinterpret_cast<mirror::Object*>(static_cast<uint32_t>(shadow_frame->GetVReg(i))));
+                reinterpret_cast32<mirror::Object*>(shadow_frame->GetVReg(i)));
       shadow_frame->SetVRegReference(i, result.GetL());
       DCHECK_EQ(shadow_frame->GetVRegReference(i),
-                reinterpret_cast<mirror::Object*>(static_cast<uint32_t>(shadow_frame->GetVReg(i))));
+                reinterpret_cast32<mirror::Object*>(shadow_frame->GetVReg(i)));
     }
   }
 }
@@ -1445,7 +1446,7 @@
   // If both register locations contains the same value, the register probably holds a reference.
   // Note: As an optimization, non-moving collectors leave a stale reference value
   // in the references array even after the original vreg was overwritten to a non-reference.
-  if (src_value == reinterpret_cast<uintptr_t>(o.Ptr())) {
+  if (src_value == reinterpret_cast32<uint32_t>(o.Ptr())) {
     new_shadow_frame->SetVRegReference(dest_reg, o);
   } else {
     new_shadow_frame->SetVReg(dest_reg, src_value);