[perf-prof] Fix erroneous code offsets in unwinding info

src/compiler/code-generator.cc

Index: src/compiler/code-generator.cc
diff --git a/src/compiler/code-generator.cc b/src/compiler/code-generator.cc
index 787d8e56352411ca48a2697984e80f7bd7d135e3..3723a98ebe559f587fda0526c8a4470e19c0a88a 100644
--- a/src/compiler/code-generator.cc
+++ b/src/compiler/code-generator.cc
@@ -220,10 +220,13 @@ Handle<Code> CodeGenerator::GenerateCode() {
     }
   }
 
-  safepoints()->Emit(masm(), frame()->GetTotalFrameSlotCount());
-
+  // The PerfJitLogger logs code up until here, excluding the safepoint
+  // table. Resolve the unwinding info now so it is aware of the same code size
+  // as reported by perf.
   unwinding_info_writer_.Finish(masm()->pc_offset());
 
+  safepoints()->Emit(masm(), frame()->GetTotalFrameSlotCount());
+
   Handle<Code> result = v8::internal::CodeGenerator::MakeCodeEpilogue(
       masm(), unwinding_info_writer_.eh_frame_writer(), info, Handle<Object>());
   result->set_is_turbofanned(true);