Dart SDK Spelling b, c, and d.

runtime/vm/flow_graph.h

Index: runtime/vm/flow_graph.h
diff --git a/runtime/vm/flow_graph.h b/runtime/vm/flow_graph.h
index 58bfc1e2551be47bc83ac7288bb98a2f49e7648a..5cfd9310d7724f5df5d60d820db272fcd7217616 100644
--- a/runtime/vm/flow_graph.h
+++ b/runtime/vm/flow_graph.h
@@ -213,7 +213,7 @@ class FlowGraph : public ZoneAllocated {
   // Insert a redefinition of an original definition after prev and rename all
   // dominated uses of the original.  If an equivalent redefinition is already
   // present, nothing is inserted.
-  // Returns the redefintion, if a redefinition was inserted, NULL otherwise.
+  // Returns the redefinition, if a redefinition was inserted, NULL otherwise.
   RedefinitionInstr* EnsureRedefinition(Instruction* prev,
                                         Definition* original,
                                         CompileType compile_type);