Fix the flag --reorder-basic-blocks so it works to disable reordering.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
diff --git a/runtime/vm/compiler.cc b/runtime/vm/compiler.cc
index 1e6ce1430f476b0dfcfb45eff61a973ca228eaa4..561782b820db305cfc9a23cb830384f76da9a564 100644
--- a/runtime/vm/compiler.cc
+++ b/runtime/vm/compiler.cc
@@ -46,14 +46,15 @@ DEFINE_FLAG(bool, loop_invariant_code_motion, true,
     "Do loop invariant code motion.");
 DEFINE_FLAG(bool, propagate_types, true, "Do static type propagation.");
 DEFINE_FLAG(bool, allocation_sinking, true,
-    "attempt to sink temporary allocations to side exits");
+    "Attempt to sink temporary allocations to side exits");
 DEFINE_FLAG(int, deoptimization_counter_threshold, 16,
     "How many times we allow deoptimization before we disallow optimization.");
 DEFINE_FLAG(int, deoptimization_counter_licm_threshold, 8,
     "How many times we allow deoptimization before we disable LICM.");
 DEFINE_FLAG(bool, use_inlining, true, "Enable call-site inlining");
 DEFINE_FLAG(bool, range_analysis, true, "Enable range analysis");
-DEFINE_FLAG(bool, reorder_basic_blocks, true, "Enable basic-block reordering.");
+DEFINE_FLAG(bool, reorder_basic_blocks, false,
+    "Enable basic-block reordering.");
 DEFINE_FLAG(bool, verify_compiler, false,
     "Enable compiler verification assertions");
 DECLARE_FLAG(bool, print_flow_graph);