src: remove identical V macro

This commit removes one of the V macros in IsolateData::MemoryInfo as
they are identical as far as I can tell.

PR-URL: #36427
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>

src/env.cc

@@ -211,10 +211,7 @@ void IsolateData::MemoryInfo(MemoryTracker* tracker) const {
 #define V(PropertyName, StringValue)                                           \
   tracker->TrackField(#PropertyName, PropertyName());
   PER_ISOLATE_SYMBOL_PROPERTIES(V)
-#undef V
 
-#define V(PropertyName, StringValue)                                           \
-  tracker->TrackField(#PropertyName, PropertyName());
   PER_ISOLATE_STRING_PROPERTIES(V)
 #undef V