Debug Info: improve the Finder.

Improve the Finder to handle context of a DIVariable used by DbgValueInst.
Fix testing cases to make them pass the verifier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187052 91177308-0d34-0410-b5e6-96231b3b80d8
[mips] Remove XFAIL from test-ptr-reloc-remote.ll

The change r187019 has fixed multiple relocations in dynamic linker for
MIPS, so now this test passes for MIPS.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187053 91177308-0d34-0410-b5e6-96231b3b80d8
Update old llc documentation.

Patch by Hafiz Abid!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187056 91177308-0d34-0410-b5e6-96231b3b80d8