Simplify JumpTarget::ComputeEntryFrame. Eliminate a separate pass...

src/ia32/register-allocator-ia32.cc

Index: src/ia32/register-allocator-ia32.cc
===================================================================
--- src/ia32/register-allocator-ia32.cc	(revision 1905)
+++ src/ia32/register-allocator-ia32.cc	(working copy)
@@ -97,6 +97,12 @@
 }
 
 
+bool RegisterAllocator::IsReserved(int reg_code) {
+  // Test below relies on the order of register codes.
+  return reg_code >= esp.code() && reg_code <= esi.code();
+}
+
+
 void RegisterAllocator::Initialize() {
   Reset();
   // The following register is live on function entry, saved in the