Fix issue 553: function frame is skipped in profile when compare stub is called.

src/platform-macos.cc

Index: src/platform-macos.cc
diff --git a/src/platform-macos.cc b/src/platform-macos.cc
index 0d5be45eec39342204952de0d7c487e1c4a83a7b..aeb69b2a6e748927f2c1e264a8c752d269d87e48 100644
--- a/src/platform-macos.cc
+++ b/src/platform-macos.cc
@@ -559,9 +559,9 @@ class Sampler::PlatformData : public Malloced {
                              flavor,
                              reinterpret_cast<natural_t*>(&state),
                              &count) == KERN_SUCCESS) {
-          sample.pc = state.REGISTER_FIELD(ip);
-          sample.sp = state.REGISTER_FIELD(sp);
-          sample.fp = state.REGISTER_FIELD(bp);
+          sample.pc = reinterpret_cast<Address>(state.REGISTER_FIELD(ip));
+          sample.sp = reinterpret_cast<Address>(state.REGISTER_FIELD(sp));
+          sample.fp = reinterpret_cast<Address>(state.REGISTER_FIELD(bp));
           sampler_->SampleStack(&sample);
         }
         thread_resume(profiled_thread_);