docs: Fix long standing linking antipattern.

Before we learned about :doc:, we used :ref: and put a dummy link at the
top of each page. Don't do that anymore.

This fixes PR14891 as a special case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172162 91177308-0d34-0410-b5e6-96231b3b80d8
SMDiagnostic: don't emit ranges if there are /any/ multibyte characters.

Right now, only OS X has a way to determine the column width of a string
(PR14910). Until we have a good way to deal with this, we just won't
print carets, source ranges, or fixits for SMDiagnostic if the source line
has multibyte characters in it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172164 91177308-0d34-0410-b5e6-96231b3b80d8
Revert r172153, "llvm/lib/MC/MCParser/AsmParser.cpp: [ms-inline-asm] Fix a couple of undefined behaviors. Operand->needAddressOf() is not initialized at !Operand->isReg()."

It has been redundant since r172157.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172166 91177308-0d34-0410-b5e6-96231b3b80d8