[llvm] [SPIR-V] Add lowering of ptrtoaddr (PR #184577)

[Juan Manuel Martinez Caamaño via llvm-commits]

================
@@ -1725,6 +1726,16 @@ Instruction *SPIRVEmitIntrinsics::visitBitCastInst(BitCastInst &I) {
   return NewI;
 }
 
+Instruction *SPIRVEmitIntrinsics::visitPtrToAddrInst(PtrToAddrInst &I) {
+  // Replace PtrToAddr with PtrToInt.
+  auto *PtrToInt =
+      CastInst::Create(Instruction::PtrToInt, I.getOperand(0), I.getType());
+  PtrToInt->insertBefore(I.getIterator());
+  replaceAllUsesWith(&I, PtrToInt);
+  I.eraseFromParent();
----------------
jmmartinez wrote:

>From `BasicBlockUtils.h`

```suggestion
  ReplaceInstWithInst(I, PtrToInt);
```
This function also copies the debug-location.

https://github.com/llvm/llvm-project/pull/184577