Add --trace flag to fast compiler.

src/ia32/fast-codegen-ia32.cc

Index: src/ia32/fast-codegen-ia32.cc
===================================================================
--- src/ia32/fast-codegen-ia32.cc	(revision 3101)
+++ src/ia32/fast-codegen-ia32.cc	(working copy)
@@ -79,6 +79,10 @@
     VisitDeclarations(fun->scope()->declarations());
   }
 
+  if (FLAG_trace) {
+    __ CallRuntime(Runtime::kTraceEnter, 0);
+  }
+
   { Comment cmnt(masm_, "[ Body");
     VisitStatements(fun->body());
   }
@@ -88,6 +92,11 @@
     // body.
     __ mov(eax, Factory::undefined_value());
     SetReturnPosition(fun);
+
+    if (FLAG_trace) {
+      __ push(eax);
+      __ CallRuntime(Runtime::kTraceExit, 1);
+    }
     __ RecordJSReturn();
     // Do not use the leave instruction here because it is too short to
     // patch with the code required by the debugger.
@@ -138,7 +147,12 @@
     ASSERT(expr->AsLiteral() != NULL);
     __ mov(eax, expr->AsLiteral()->handle());
   }
+  if (FLAG_trace) {
+    __ push(eax);
+    __ CallRuntime(Runtime::kTraceExit, 1);
+  }
   __ RecordJSReturn();
+
   // Do not use the leave instruction here because it is too short to
   // patch with the code required by the debugger.
   __ mov(esp, ebp);