doesSectionRequireSymbols is meaningless on ELF, remove.

This is a nop. doesSectionRequireSymbols is only used from
isSymbolLinkerVisible. isSymbolLinkerVisible only use from ELF was in

if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined())
  return false;

if (Symbol.isTemporary())
  return false;

If the symbol is a temporary this code returns false and it is irrelevant if
we take the first if or not. If the symbol is not a temporary,
Asm.isSymbolLinkerVisible returns true without ever calling
doesSectionRequireSymbols.

This was an horrible leftover from when support for ELF was first added.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200894 91177308-0d34-0410-b5e6-96231b3b80d8
don't set HasReliableSymbolDifference for ELF.

It is only used in MachObjectWriter.cpp. Another leftover from early days
of ELF in MC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200895 91177308-0d34-0410-b5e6-96231b3b80d8
Update the X86 assembler for .intel_syntax to accept
the << and >> bitwise operators.

rdar://15975725


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200896 91177308-0d34-0410-b5e6-96231b3b80d8