Simplify a really complicated check for Arch == X86_64.

The function hasReliableSymbolDifference had exactly one use in the MachO
writer. It is also only true for X86_64. In fact, the comments refers to
"Darwin x86_64" and everything else, so this makes the code match the
comment.

If this is to be abstracted again, it should be a property of
TargetObjectWriter, like useAggressiveSymbolFolding.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203605 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MachObjectWriter.cpp

@@ -688,7 +688,8 @@ IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
     // same assumptions about any symbol that we normally make about
     // assembler locals.
 
-    if (!Asm.getBackend().hasReliableSymbolDifference()) {
+    bool hasReliableSymbolDifference = isX86_64();
+    if (!hasReliableSymbolDifference) {
       if (!SA.isInSection() || &SecA != &SecB ||
           (!SA.isTemporary() &&
            FB.getAtom() != Asm.getSymbolData(SA).getFragment()->getAtom() &&