[llvm] [AArch64] Implement -fno-plt for SelectionDAG/GlobalISel (PR #78890)

[Matt Arsenault via llvm-commits]

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@@ -1301,8 +1301,19 @@ bool AArch64CallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
            !Subtarget.noBTIAtReturnTwice() &&
            MF.getInfo<AArch64FunctionInfo>()->branchTargetEnforcement())
     Opc = AArch64::BLR_BTI;
-  else
+  else {
+    // For an intrinsic call (e.g. memset), use GOT if "RtLibUseGOT" (-fno-plt)
+    // is set.
+    if (Info.Callee.isSymbol() && F.getParent()->getRtLibUseGOT()) {
+      auto Reg =
+          MRI.createGenericVirtualRegister(getLLTForType(*F.getType(), DL));
+      MIRBuilder.buildInstr(TargetOpcode::G_GLOBAL_VALUE)
+          .addDef(Reg)
+          .addExternalSymbol(Info.Callee.getSymbolName(), AArch64II::MO_GOT);
+      Info.Callee = MachineOperand::CreateReg(Reg, false);
+    }
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arsenm wrote:

Still should fix this API 

https://github.com/llvm/llvm-project/pull/78890