[clang] [CIR] Add support for indirect calls (PR #139748)

[Andy Kaylor via cfe-commits]

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@@ -1826,6 +1821,9 @@ class CIR_CallOpBase<string mnemonic, list<Trait> extra_traits = []>
     ::mlir::Attribute removeArgAttrsAttr() { return {}; }
     ::mlir::Attribute removeResAttrsAttr() { return {}; }
 
+    bool isIndirect() { return !getCallee(); }
+    mlir::Value getIndirectCall();
+
     void setArg(unsigned index, mlir::Value value) {
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andykaylor wrote:

This function needs to be updated for indirect calls.

https://github.com/llvm/llvm-project/pull/139748