Implements a new API to set a function entry hook for profiling.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 2867d5ec7203c1ab76b725ed6f0187e46e0dd4a7..5daf94029f96f199eb32a56ce52c821e062a0b8c 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -123,6 +123,8 @@ void FullCodeGenerator::Generate() {
   SetFunctionPosition(function());
   Comment cmnt(masm_, "[ function compiled by full code generator");
 
+  ProfileEntryHookStub::MaybeCallEntryHook(masm_);
+
 #ifdef DEBUG
   if (strlen(FLAG_stop_at) > 0 &&
       info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
@@ -4550,7 +4552,6 @@ FullCodeGenerator::NestedStatement* FullCodeGenerator::TryFinally::Exit(
   return previous_;
 }
 
-
 #undef __
 
 } }  // namespace v8::internal