[clang] [CIR] Add calling_conv attribute to FuncOp with lowering support (PR #189345)

[Rana Pratap Reddy via cfe-commits]

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@@ -1293,8 +1293,8 @@ mlir::Value CIRGenFunction::emitRuntimeCall(mlir::Location loc,
                                             cir::FuncOp callee,
                                             ArrayRef<mlir::Value> args,
                                             mlir::NamedAttrList attrs) {
-  // TODO(cir): set the calling convention to this runtime call.
-  assert(!cir::MissingFeatures::opFuncCallingConv());
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ranapratap55 wrote:

Restored.

https://github.com/llvm/llvm-project/pull/189345