symbolizer: avoid SyntaxWarning in regexps

symbolizer: fix and improve running with -c arugment

Fix symbolizing symbols with matching offsets

Fix symbolizer incorrectly extracting symbol sizes

Fix code links

Add UBSAN.md

Update KMSAN.md

Update KTSAN.md

Update KASAN.md

Update FOUND_BUGS.md

Update FOUND_BUGS.md

Make KFENCE summary more crisp

Update KCSAN.md

Update KCSAN.md

Update KCSAN.md