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

[Fangrui Song via llvm-commits]

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@@ -144,9 +144,16 @@ bool CallLowering::lowerCall(MachineIRBuilder &MIRBuilder, const CallBase &CB,
   // Try looking through a bitcast from one function type to another.
   // Commonly happens with calls to objc_msgSend().
   const Value *CalleeV = CB.getCalledOperand()->stripPointerCasts();
-  if (const Function *F = dyn_cast<Function>(CalleeV))
-    Info.Callee = MachineOperand::CreateGA(F, 0);
-  else if (isa<GlobalIFunc>(CalleeV) || isa<GlobalAlias>(CalleeV)) {
+  if (const Function *F = dyn_cast<Function>(CalleeV)) {
+    if (F->hasFnAttribute(Attribute::NonLazyBind)) {
+      auto Reg =
+          MRI.createGenericVirtualRegister(getLLTForType(*F->getType(), DL));
+      MIRBuilder.buildGlobalValue(Reg, F);
----------------
MaskRay wrote:

After clang-format, this becomes
```
-      auto Reg =
-          MRI.createGenericVirtualRegister(getLLTForType(*F->getType(), DL));
-      MIRBuilder.buildGlobalValue(Reg, F);
+      Register Reg =
+          MIRBuilder.buildGlobalValue(getLLTForType(*F->getType(), DL), F)
+              .getReg(0);
```

which is not shorter... In addition, the new code `AArch64CallLowering.cpp` uses `createGenericVirtualRegister`. So sticking with `createGenericVirtualRegister` here adds consistency.

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