jit: fail early in ffcps_* if subject shorter than offs1 #175
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FF_FUN would try loading a vector from an invalid address triggering a crash. Add the same check that is done in the x86/s390x implementations and that was missing from the original code. Fixes: PCRE2Project#86
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This is the minimal change required to solvce the reported crash and has been validated in production.
Fixes: #86