[test][llvm-dwarfdump][NFC] Remove unused check

# RESERVED: warning: parsing line table prologue at offset 0x00000048 unsupported reserved unit length found of value 0xfffffffe

# MD5: warning: parsing line table prologue at 0x00000000 found an invalid directory or file table description at 0x0000003b

# MD5-NEXT: warning: failed to parse file entry because the MD5 hash is invalid

# ALL-NOT:  warning:

# ALL:      warning: parsing line table prologue at offset 0x00000048 found unsupported version 0x00

# ALL-NEXT: warning: parsing line table prologue at offset 0x0000004e found unsupported version 0x01