[Mips] Use OR operation to set the microMIPS bit

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224813 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Rename the function s/readAddend/getAddend/

No functional changes.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224814 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Factor out the code checks a symbol's binding

No functional changes.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224815 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Make the comment more descriptive

No functional changes.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224816 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Join two if statements

No functional changes.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224817 91177308-0d34-0410-b5e6-96231b3b80d8