[AsmPrinter][TLOF] ARM64 MachO support for replacing GOT equivalents

Follow up r230264 and add ARM64 support for replacing global GOT
equivalent symbol accesses by references to the GOT entry for the final
symbol instead, example:

-- before

   .globl  _foo
  _foo:
   .long   42

   .globl  _gotequivalent
  _gotequivalent:
   .quad   _foo

   .globl  _delta
  _delta:
   .long   _gotequivalent-_delta

-- after

   .globl  _foo
  _foo:
   .long   42

   .globl  _delta
  Ltmp3:
   .long _foo@GOT-Ltmp3

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231474 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -2084,9 +2084,13 @@ static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
   //
   //    gotpcrelcst := <offset from @foo base> + <cst>
   //
+  // Only encode <cst> if the target supports it.
+  //
   int64_t GOTPCRelCst = Offset + MV.getConstant();
   if (GOTPCRelCst < 0)
     return;
+  if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
+    return;
 
   // Emit the GOT PC relative to replace the got equivalent global, i.e.:
   //
@@ -2110,7 +2114,8 @@ static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
   const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
   const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
   *ME = AP.getObjFileLowering().getIndirectSymViaGOTPCRel(FinalSym,
-                                                          GOTPCRelCst);
+                                                          GOTPCRelCst,
+                                                          AP.OutStreamer);
 
   // Update GOT equivalent usage information
   --NumUses;