[heap] Separate out optimized code map processing.

src/heap/gc-tracer.cc

Index: src/heap/gc-tracer.cc
diff --git a/src/heap/gc-tracer.cc b/src/heap/gc-tracer.cc
index a37b832358e3f90a3198668ac81f2d29f027d35c..f7bd8d07d221da2d76d9386f32b4b093e435ad32 100644
--- a/src/heap/gc-tracer.cc
+++ b/src/heap/gc-tracer.cc
@@ -492,6 +492,7 @@ void GCTracer::PrintNVP() const {
                    "mark_weakrefs=%.1f "
                    "mark_globalhandles=%.1f "
                    "mark_codeflush=%.1f "
+                   "mark_optimizedcodemaps=%.1f "
                    "store_buffer_clear=%.1f "
                    "slots_buffer_clear=%.1f "
                    "sweep=%.2f "
@@ -558,6 +559,7 @@ void GCTracer::PrintNVP() const {
                    current_.scopes[Scope::MC_MARK_WEAK_REFERENCES],
                    current_.scopes[Scope::MC_MARK_GLOBAL_HANDLES],
                    current_.scopes[Scope::MC_MARK_CODE_FLUSH],
+                   current_.scopes[Scope::MC_MARK_OPTIMIZED_CODE_MAPS],
                    current_.scopes[Scope::MC_STORE_BUFFER_CLEAR],
                    current_.scopes[Scope::MC_SLOTS_BUFFER_CLEAR],
                    current_.scopes[Scope::MC_SWEEP],