[docs] Fix up some links to the preferred style.

:doc:`...` and :ref:`...` links help Sphinx keep track the dependencies
between documents and ensure that they are not pointing to nowhere.

Raw HTML links work just fine and are easier for people less familiar
with reST/Sphinx. They are easy to change over to the :doc:/:ref: style
after the fact so this is not a problem.

This commit doesn't fix all of them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205792 91177308-0d34-0410-b5e6-96231b3b80d8
[docs] VCS contains a record of authorship

No need to explicitly mention the author in the document.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205793 91177308-0d34-0410-b5e6-96231b3b80d8
in findGCD of multiply expr return the gcd

we used to return 1 instead of the gcd

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205800 91177308-0d34-0410-b5e6-96231b3b80d8
handle special cases when findGCD returns 1

used to fail with 'Step should divide Start with no remainder.'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205801 91177308-0d34-0410-b5e6-96231b3b80d8
divide by the result of the gcd

used to fail with 'Step should divide Start with no remainder.'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205802 91177308-0d34-0410-b5e6-96231b3b80d8
Bug 19348: Check for legal ExtLoad operation before folding

(aext (zextload x)) -> (aext (truncate (*extload x)))

Patch by Stanislav Mekhanoshin!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205805 91177308-0d34-0410-b5e6-96231b3b80d8