[iwyu] Fix js-context-specialization.h

R=mstarzinger@chromium.org

Bug: v8:7965
Change-Id: I26c85e7791550cff269ffc998077501a1eaef3a5
Reviewed-on: https://chromium-review.googlesource.com/c/1303718
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57073}

src/compiler/js-context-specialization.h

@@ -18,11 +18,12 @@ class JSOperatorBuilder;
 
 // Pair of a context and its distance from some point of reference.
 struct OuterContext {
-  OuterContext() : context(), distance() {}
+  OuterContext() = default;
   OuterContext(Handle<Context> context_, size_t distance_)
       : context(context_), distance(distance_) {}
+
   Handle<Context> context;
-  size_t distance;
+  size_t distance = 0;
 };
 
 // Specializes a given JSGraph to a given context, potentially constant folding

tools/generate-header-include-checks.py

@@ -29,7 +29,6 @@ AUTO_EXCLUDE = [
   # flag-definitions.h needs a mode set for being included.
   'src/flag-definitions.h',
   # blacklist of headers we need to fix (https://crbug.com/v8/7965).
-  'src/compiler/js-context-specialization.h',
   'src/regexp/jsregexp.h',
   'src/snapshot/object-deserializer.h',
   'src/transitions.h',