Move assert.h/assert.cc from runtime/vm to runtime/platform

runtime/platform/assert.h

Index: runtime/platform/assert.h
diff --git a/runtime/vm/assert.h b/runtime/platform/assert.h
similarity index 98%
rename from runtime/vm/assert.h
rename to runtime/platform/assert.h
index 2e7eba5d7b838ded3663a24ffc13db36cf064128..aa4b39e16949f446e743676ceed19a060526d53f 100644
--- a/runtime/vm/assert.h
+++ b/runtime/platform/assert.h
@@ -2,8 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#ifndef VM_ASSERT_H_
-#define VM_ASSERT_H_
+#ifndef PLATFORM_ASSERT_H_
+#define PLATFORM_ASSERT_H_
 
 // TODO(5411406): include sstream for now, once we have a Utils::toString()
 // implemented for all the primitive types we can replace the usage of
@@ -13,7 +13,7 @@
 #include <string>
 #endif
 
-#include "vm/globals.h"
+#include "platform/globals.h"
 
 #if !defined(DEBUG) && !defined(NDEBUG)
 #error neither DEBUG nor NDEBUG defined
@@ -293,4 +293,4 @@ void DynamicAssertionHelper::GreaterEqual(const E& left, const A& right) {
 #define WARN2(format, p1, p2)                                                 \
   dart::Expect(__FILE__, __LINE__).Fail(format, (p1), (p2))
 
-#endif  // VM_ASSERT_H_
+#endif  // PLATFORM_ASSERT_H_