This patch much improves our tracking of whether function is...

src/runtime.cc

Index: src/runtime.cc
===================================================================
--- src/runtime.cc	(revision 2034)
+++ src/runtime.cc	(working copy)
@@ -4318,9 +4318,15 @@
   }
 #endif
 
-  // Compile the target function.
+  // Compile the target function.  Here we compile using CompileLazyInLoop in
+  // order to get the optimized version.  This helps code like delta-blue
+  // that calls performance-critical routines through constructors.  A
+  // constructor call doesn't use a CallIC, it uses a LoadIC followed by a
+  // direct call.  Since the in-loop tracking takes place through CallICs
+  // this means that things called through constructors are never known to
+  // be in loops.  We compile them as if they are in loops here just in case.
   ASSERT(!function->is_compiled());
-  if (!CompileLazy(function, KEEP_EXCEPTION)) {
+  if (!CompileLazyInLoop(function, KEEP_EXCEPTION)) {
     return Failure::Exception();
   }