Spelling fixes e to i.

pkg/compiler/lib/src/ssa/types_propagation.dart

Index: pkg/compiler/lib/src/ssa/types_propagation.dart
diff --git a/pkg/compiler/lib/src/ssa/types_propagation.dart b/pkg/compiler/lib/src/ssa/types_propagation.dart
index f39862964550acc0d86609119ba722379fc81817..0a056991878aec5bf32a499b8e32032c2c46e913 100644
--- a/pkg/compiler/lib/src/ssa/types_propagation.dart
+++ b/pkg/compiler/lib/src/ssa/types_propagation.dart
@@ -370,7 +370,7 @@ class SsaTypePropagator extends HBaseVisitor implements OptimizationPhase {
     TypeMask receiverType = receiver.instructionType;
     instruction.mask = receiverType;
 
-    // Try to specialize the receiver after this call by instering a refinement
+    // Try to specialize the receiver after this call by inserting a refinement
     // node (HTypeKnown). There are two potentially expensive tests - are there
     // any uses of the receiver dominated by and following this call?, and what
     // is the refined type? The first is expensive if the receiver has many