[clang] [CIR] Upstream global initialization for ComplexType (PR #141369)

[Henrich Lauko via cfe-commits]

================
@@ -577,12 +577,31 @@ mlir::Attribute ConstantEmitter::tryEmitPrivate(const 
APValue &value,
   case APValue::Union:
     cgm.errorNYI("ConstExprEmitter::tryEmitPrivate struct or union");
     return {};
-  case APValue::FixedPoint:
   case APValue::ComplexInt:
-  case APValue::ComplexFloat:
+  case APValue::ComplexFloat: {
+    mlir::Type desiredType = cgm.convertType(destType);
+    cir::ComplexType complexType =
+        mlir::dyn_cast<cir::ComplexType>(desiredType);
+
+    mlir::Type compelxElemTy = complexType.getElementType();
+    if (isa<cir::IntType>(compelxElemTy)) {
+      llvm::APSInt real = value.getComplexIntReal();
+      llvm::APSInt imag = value.getComplexIntImag();
+      return builder.getAttr<cir::ConstComplexAttr>(
+          complexType, builder.getAttr<cir::IntAttr>(compelxElemTy, real),
+          builder.getAttr<cir::IntAttr>(compelxElemTy, imag));
+    }
+
+    llvm::APFloat real = value.getComplexFloatReal();
+    llvm::APFloat imag = value.getComplexFloatImag();
+    return builder.getAttr<cir::ConstComplexAttr>(
+        complexType, builder.getAttr<cir::FPAttr>(compelxElemTy, real),
----------------
xlauko wrote:

```suggestion
        complexType, builder.getAttr<cir::FPAttr>(complexElemTy, real),
```

https://github.com/llvm/llvm-project/pull/141369
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