Fix some bounds issues in API tests

[achristensen07]

d5d4ade

Fix some bounds issues in API tests
https://bugs.webkit.org/show_bug.cgi?id=252779
rdar://105784168

Reviewed by Darin Adler.

Asan found some out of bounds operations because of how we wrote our tests.

* Tools/TestWebKitAPI/Tests/WTF/CompactRefPtr.cpp:
(TestWebKitAPI::returnConstRefCountedRef):
(TestWebKitAPI::returnRefCountedRef):
* Tools/TestWebKitAPI/Tests/WTF/FixedBitVector.cpp:
(TestWebKitAPI::testFixedBitVectorFindBit):
* Tools/TestWebKitAPI/Tests/WTF/PackedRefPtr.cpp:
(TestWebKitAPI::returnConstRefCountedRef):
(TestWebKitAPI::returnRefCountedRef):
* Tools/TestWebKitAPI/Tests/WTF/RefPtr.cpp:
(TestWebKitAPI::returnConstRefCountedRef):
(TestWebKitAPI::returnRefCountedRef):

Canonical link: https://commits.webkit.org/260746@main

a72f09b

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	❌ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim
✅ 🛠 🧪 unsafe-merge

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 1cd788f)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	⏳ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk
✅ 🧪 webkitperl	🧪 ios-wk2	✅ 🧪 api-mac	🧪 gtk-wk2
	🧪 api-ios	🧪 mac-wk1	🧪 api-gtk
⏳ 🛠 🧪 jsc	✅ 🛠 tv	🧪 mac-wk2	⏳ 🛠 jsc-armv7
	✅ 🛠 tv-sim	🧪 mac-AS-debug-wk2	⏳ 🧪 jsc-armv7-tests
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash a72f09b)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	❌ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim
✅ 🛠 🧪 unsafe-merge

[webkit-commit-queue]

Committed 260746@main (d5d4ade): https://commits.webkit.org/260746@main

Reviewed commits have been landed. Closing PR #10543 and removing active labels.