Optimize isFinite and isNaN.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 30d6f222de3dfd8fc2c88755558ba880f7d59d3d..d685b8a34453d4e470f5df9737e0d456b5f19fe3 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -30,7 +30,6 @@
 #include "api.h"
 #include "ast-inl.h"
 #include "bootstrapper.h"
-#include "char-predicates-inl.h"
 #include "codegen.h"
 #include "compiler.h"
 #include "func-name-inferrer.h"
@@ -1560,6 +1559,9 @@ Block* Parser::ParseScopedBlock(ZoneStringList* labels, bool* ok) {
   Scope* block_scope = NewScope(top_scope_,
                                 Scope::BLOCK_SCOPE,
                                 inside_with());
+  body->set_block_scope(block_scope);
+  block_scope->DeclareLocal(isolate()->factory()->block_scope_symbol(),
+                            Variable::VAR);
   if (top_scope_->is_strict_mode()) {
     block_scope->EnableStrictMode();
   }
@@ -1582,28 +1584,21 @@ Block* Parser::ParseScopedBlock(ZoneStringList* labels, bool* ok) {
     }
   }
   Expect(Token::RBRACE, CHECK_OK);
-  top_scope_ = saved_scope;
 
-  block_scope = block_scope->FinalizeBlockScope();
-  body->set_block_scope(block_scope);
+  // Create exit block.
+  Block* exit = new(zone()) Block(isolate(), NULL, 1, false);
+  exit->AddStatement(new(zone()) ExitContextStatement());
 
-  if (block_scope != NULL) {
-    // Create exit block.
-    Block* exit = new(zone()) Block(isolate(), NULL, 1, false);
-    exit->AddStatement(new(zone()) ExitContextStatement());
-
-    // Create a try-finally statement.
-    TryFinallyStatement* try_finally =
-        new(zone()) TryFinallyStatement(body, exit);
-    try_finally->set_escaping_targets(collector.targets());
+  // Create a try-finally statement.
+  TryFinallyStatement* try_finally =
+      new(zone()) TryFinallyStatement(body, exit);
+  try_finally->set_escaping_targets(collector.targets());
+  top_scope_ = saved_scope;
 
-    // Create a result block.
-    Block* result = new(zone()) Block(isolate(), NULL, 1, false);
-    result->AddStatement(try_finally);
-    return result;
-  } else {
-    return body;
-  }
+  // Create a result block.
+  Block* result = new(zone()) Block(isolate(), NULL, 1, false);
+  result->AddStatement(try_finally);
+  return result;
 }