[subset] Add hb_ot_layout_collect_features to harfbuzz-sections.txt.
Add the fuzzer test case for feature collection timeout.

docs/harfbuzz-sections.txt

diff --git a/docs/harfbuzz-sections.txt b/docs/harfbuzz-sections.txt
index b93cd1d..5cf5a88 100644
--- a/docs/harfbuzz-sections.txt
+++ b/docs/harfbuzz-sections.txt
@@ -447,6 +447,7 @@
 HB_OT_TAG_GSUB
 HB_OT_TAG_JSTF
 hb_ot_layout_collect_lookups
+hb_ot_layout_collect_features
 hb_ot_layout_feature_get_lookups
 hb_ot_layout_feature_with_variations_get_lookups
 hb_ot_layout_get_attach_points

test/api/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5542653037903872

diff --git a/test/api/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5542653037903872 b/test/api/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5542653037903872
new file mode 100644
index 0000000..6307ddd
--- /dev/null
+++ b/test/api/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5542653037903872
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