Revert r10690. Enable inlining of Math.floor again.

The test failures reported in issue v8:1947 are unrelated to this change since it is not reproducible anymore.

BUG=v8:1947
Review URL: https://chromiumcodereview.appspot.com/9365048

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10692 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen.cc

@@ -5173,6 +5173,7 @@ 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: