Switch to the new compiler onIA32.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
===================================================================
--- runtime/vm/compiler.cc	(revision 8981)
+++ runtime/vm/compiler.cc	(working copy)
@@ -32,13 +32,7 @@
 DEFINE_FLAG(int, deoptimization_counter_threshold, 5,
     "How many times we allow deoptimization before we disallow"
     " certain optimizations");
-#if defined(TARGET_ARCH_X64)
-DEFINE_FLAG(bool, use_new_compiler, true,
-    "Try to use the new compiler backend.");
-#else
-DEFINE_FLAG(bool, use_new_compiler, false,
-    "Try to use the new compiler backend.");
-#endif
+DEFINE_FLAG(bool, use_new_compiler, true, "Use the new compiler backend.");
 DEFINE_FLAG(bool, trace_bailout, false, "Print bailout from new compiler.");