[ELF] - ICF: remove excessive check. NFC.

Change removes the excessive comparsion of
the relocation arrays sizes.

This code was dead, because at the higer level,
equalsConstant function contains the following check:

`A->NumRelocations != B->NumRelocations`
where NumRelocations contains the size of the relocations array.
So removed check did the same job twice.

This was found with use of code coverage analysis.

llvm-svn: 335346