[CIR] Implement CompoundLiteralExpr for ComplexType

[AmrDeveloper]

Implement CompoundLiteralExpr for ComplexType

[github-actions]

⚠️ undef deprecator found issues in your code. ⚠️

You can test this locally with the following command:

git diff -U0 --pickaxe-regex -S '([^a-zA-Z0-9#_-]undef[^a-zA-Z0-9_-]|UndefValue::get)' 32e3971d31452620eb102f122259b429733b3ef0 689cbe85ec79341917eafd0b9b2733b185411906 clang/test/CIR/CodeGen/complex.init-list.c clang/lib/CIR/CodeGen/CIRGenExpr.cpp clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp

The following files introduce new uses of undef:

• clang/test/CIR/CodeGen/complex.init-list.c

Undef is now deprecated and should only be used in the rare cases where no replacement is possible. For example, a load of uninitialized memory yields undef. You should use poison values for placeholders instead.

In tests, avoid using undef and having tests that trigger undefined behavior. If you need an operand with some unimportant value, you can add a new argument to the function and use that instead.

For example, this is considered a bad practice:

define void @fn() {
  ...
  br i1 undef, ...
}

Please use the following instead:

define void @fn(i1 %cond) {
  ...
  br i1 %cond, ...
}

Please refer to the Undefined Behavior Manual for more information.