[Mips] Add one more MIPS relocation type constant.
[yaml2obj][ELF] Assign name (.shstrtab) to the section holds sections names.
[yaml2obj][ELF] Remove unused ELFState class field.
[yaml2obj][ELF] Refer to a section in the error message by its name not
index.
[yaml2obj][ELF] Use range-based for loops.