[Mips] Add the 'const' qualifier to the couple RelocationPass class
member functions.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@207434 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Convert MipsDynamicSymbolTable to the class template.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@207435 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Rewrite the R_MIPS_COPY relocation test using yaml2obj tool.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@207436 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Rename the test case.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@207437 91177308-0d34-0410-b5e6-96231b3b80d8