[ELF][test] Consolidate invalid-eh-frame tests
Merge 9 individual invalid-eh-frame test files into 2 categorized files
using split-file:
- eh-frame-invalid-cie.s: CIE structure errors (too small, unexpected
end, failed string/LEB128 reads)
- eh-frame-invalid-fde-encoding.s: EhReader::getFdeEncoding errors
(unknown augmentation string, unknown FDE encoding, unsupported
aligned encoding, corrupted CIE)
