Use crash type info when possible to help create bucket signatures

[tysmith]

For example:

==0==ERROR: AddressSanitizer: SEGV on unknown address 0x7fc718512699 (pc 0x7fc7185167a1 bp 0x60e0000b8038 sp 0x7ffda1aa7278 T0)

Although we are missing a stack trace we can tell that this is a SEGV and that it is not a null dereference.