Reapply r10690 ("Temporarily disable inlining of Math.floor called as a function")

This reverts r10692.

Review URL: https://chromiumcodereview.appspot.com/9359035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10702 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen.cc

@@ -5173,7 +5173,6 @@ bool HGraphBuilder::TryInlineBuiltinFunctionCall(Call* expr, bool drop_extra) {
   BuiltinFunctionId id = expr->target()->shared()->builtin_function_id();
   switch (id) {
     case kMathRound:
-    case kMathFloor:
     case kMathAbs:
     case kMathSqrt:
     case kMathLog: