[iwyu] Fix includes in elements-inl.h

R=titzer@chromium.org

Bug: v8:7754, v8:7965
Change-Id: I5cb76b4e989fbe6d4d08bafb60dbbb26c3d58e2d
Reviewed-on: https://chromium-review.googlesource.com/1156515Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54820}

src/elements-inl.h

@@ -8,6 +8,7 @@
 #include "src/elements.h"
 
 #include "src/handles-inl.h"
+#include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {

tools/generate-header-include-checks.py

@@ -31,7 +31,6 @@ AUTO_EXCLUDE = [
   # blacklist of headers we need to fix (https://crbug.com/v8/7965).
   'src/allocation-site-scopes.h',
   'src/arguments.h',
-  'src/ast/prettyprinter.h',
   'src/builtins/builtins-constructor.h',
   'src/builtins/builtins-utils.h',
   'src/compiler/allocation-builder.h',
@@ -44,19 +43,13 @@ AUTO_EXCLUDE = [
   'src/debug/debug-scopes.h',
   'src/debug/debug-stack-trace-iterator.h',
   'src/deoptimizer.h',
-  'src/elements.h',
-  'src/elements-inl.h',
-  'src/field-type.h',
   'src/heap/incremental-marking.h',
   'src/ic/ic.h',
-  'src/keys.h',
   'src/lookup.h',
   'src/parsing/parser.h',
   'src/parsing/preparser.h',
   'src/regexp/jsregexp.h',
-  'src/regexp/jsregexp-inl.h',
   'src/snapshot/object-deserializer.h',
-  'src/string-hasher-inl.h',
   'src/third_party/utf8-decoder/utf8-decoder.h',
   'src/transitions.h',
   'src/v8memory.h',