Update some switchable call stub names and comments.

runtime/vm/thread.h

Index: runtime/vm/thread.h
diff --git a/runtime/vm/thread.h b/runtime/vm/thread.h
index 6805ada1b8ce013bbbc0b634d852f6107bca2a8f..83bf04b0e60352a15bd6876792e4bb61998552d4 100644
--- a/runtime/vm/thread.h
+++ b/runtime/vm/thread.h
@@ -90,7 +90,7 @@ class Zone;
   V(RawCode*, monomorphic_miss_stub_,                                          \
     StubCode::MonomorphicMiss_entry()->code(), NULL)                           \
   V(RawCode*, ic_lookup_through_code_stub_,                                    \
-    StubCode::ICLookupThroughCode_entry()->code(), NULL)                       \
+    StubCode::ICCallThroughCode_entry()->code(), NULL)                         \
 
 #endif
 
@@ -109,8 +109,8 @@ class Zone;
     StubCode::UpdateStoreBuffer_entry()->EntryPoint(), 0)                      \
   V(uword, call_to_runtime_entry_point_,                                       \
     StubCode::CallToRuntime_entry()->EntryPoint(), 0)                          \
-  V(uword, megamorphic_lookup_checked_entry_,                                  \
-    StubCode::MegamorphicLookup_entry()->CheckedEntryPoint(), 0)               \
+  V(uword, megamorphic_call_checked_entry_,                                    \
+    StubCode::MegamorphicCall_entry()->CheckedEntryPoint(), 0)                 \
 
 #endif