Move utils.h and utils.cc from runtime/vm to runtime/platform

runtime/vm/disassembler_ia32.cc

Index: runtime/vm/disassembler_ia32.cc
diff --git a/runtime/vm/disassembler_ia32.cc b/runtime/vm/disassembler_ia32.cc
index 75b6a8b201d33a71a4e9640978fb00be062682a0..1d36d48dae560332aa9f57a573d557345a83dc7b 100644
--- a/runtime/vm/disassembler_ia32.cc
+++ b/runtime/vm/disassembler_ia32.cc
@@ -4,15 +4,14 @@
 
 #include "vm/disassembler.h"
 
-#include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
+#include "platform/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
-
+#include "platform/utils.h"
 #include "vm/allocation.h"
 #include "vm/code_index_table.h"
 #include "vm/heap.h"
 #include "vm/os.h"
 #include "vm/stub_code.h"
-#include "vm/utils.h"
 
 namespace dart {