Detemplatize LOHDirective.

The ARM64 backend uses it only as a container to keep an MCLOHType and
Arguments around so give it its own little copy. The other functionality
isn't used and we had a crazy method specialization hack in place to
keep it working. Unfortunately that was incompatible with MSVC.

Also range-ify a couple of loops while at it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205114 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCLinkerOptimizationHint.cpp

@@ -14,8 +14,6 @@
 
 using namespace llvm;
 
-namespace llvm {
-template<>
 void MCLOHDirective::Emit_impl(raw_ostream &OutStream,
                                const MachObjectWriter &ObjWriter,
                                const MCAsmLayout &Layout) const {
@@ -27,4 +25,3 @@ void MCLOHDirective::Emit_impl(raw_ostream &OutStream,
     encodeULEB128(ObjWriter.getSymbolAddress(&Asm.getSymbolData(**It), Layout),
                   OutStream);
 }
-} // end namespace llvm