[clang] [CIR] Add vptr type and generate vptr field when needed (PR #151377)

[Henrich Lauko via cfe-commits]

================
@@ -697,6 +697,24 @@ BoolType::getABIAlignment(const ::mlir::DataLayout 
&dataLayout,
   return 1;
 }
 
+//===----------------------------------------------------------------------===//
+//  VPtrType Definitions
+//===----------------------------------------------------------------------===//
+
+llvm::TypeSize
+VPtrType::getTypeSizeInBits(const ::mlir::DataLayout &dataLayout,
+                            ::mlir::DataLayoutEntryListRef params) const {
+  // FIXME: consider size differences under different ABIs
+  return llvm::TypeSize::getFixed(64);
+}
+
+uint64_t
+VPtrType::getABIAlignment(const ::mlir::DataLayout &dataLayout,
+                          ::mlir::DataLayoutEntryListRef params) const {
+  // FIXME: consider alignment differences under different ABIs
+  return 8;
+}
----------------
xlauko wrote:

any reason these are `::mlir` not just `mlir`?

https://github.com/llvm/llvm-project/pull/151377
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