Correct the limit of local variables in a optimized functions.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index ef0a82cee326e059a894db84eb2e021231525c91..62402e18fa9ddf501dfe5ec973c3b846f3d9e7f0 100755
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -213,10 +213,11 @@ static bool MakeCrankshaftCode(CompilationInfo* info) {
   //
   // The encoding is as a signed value, with parameters and receiver using
   // the negative indices and locals the non-negative ones.
-  const int limit = LUnallocated::kMaxFixedIndices / 2;
+  const int parameter_limit = (LUnallocated::kMaxFixedIndices / 2);
+  const int locals_limit = parameter_limit - 1;
   Scope* scope = info->scope();
-  if ((scope->num_parameters() + 1) > limit ||
-      scope->num_stack_slots() > limit) {
+  if ((scope->num_parameters() + 1) > parameter_limit ||
+      scope->num_stack_slots() > locals_limit) {
     info->AbortOptimization();
     Handle<JSFunction> closure = info->closure();
     info->shared_info()->DisableOptimization(*closure);