Remove some unnecessary binding initialization checks.

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index cde46b0eb61fc74cc155d4c4cd1b897ed5b444a0..bc96d30cc9075dd0fc7b6be2433219759955611f 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -731,8 +731,8 @@ void FullCodeGenerator::EmitDeclaration(VariableProxy* proxy,
   // need to "declare" it at runtime to make sure it actually exists in the
   // local context.
   Variable* variable = proxy->var();
-  bool binding_needs_init =
-      mode == CONST || mode == CONST_HARMONY || mode == LET;
+  bool binding_needs_init = (function == NULL) &&
+      (mode == CONST || mode == CONST_HARMONY || mode == LET);
   switch (variable->location()) {
     case Variable::UNALLOCATED:
       ++(*global_count);