[CIR] Support inheritance in InitListExpr

[HerrCai0907]

convert from codegen

      assert(!Base.isVirtual() && "should not see vbases here");
      auto *BaseRD = Base.getType()->getAsCXXRecordDecl();
      Address V = CGF.GetAddressOfDirectBaseInCompleteClass(
          Dest.getAddress(), CXXRD, BaseRD,
          /*isBaseVirtual*/ false);
      AggValueSlot AggSlot = AggValueSlot::forAddr(
          V, Qualifiers(),
          AggValueSlot::IsDestructed,
          AggValueSlot::DoesNotNeedGCBarriers,
          AggValueSlot::IsNotAliased,
          CGF.getOverlapForBaseInit(CXXRD, BaseRD, Base.isVirtual()));
      CGF.EmitAggExpr(InitExprs[curInitIndex++], AggSlot);

      if (QualType::DestructionKind dtorKind =
              Base.getType().isDestructedType())
        CGF.pushDestroyAndDeferDeactivation(dtorKind, V, Base.getType());

[bcardosolopes]

LGTM pending tests adjustment

[bcardosolopes]

Very nice! Please also add another RUN line to test for LLVM output. If the LLVM output does not match what we would get without ClangIR, please add a comment explaining what need to be improved!

[HerrCai0907]

Mostly they are the same. But llvm from cir missing some flags

// cir -> llvm
call void @_ZN2A1C2Ev(ptr %1)
// llvm
call void @_ZN2A1C2Ev(ptr noundef nonnull align 1 dereferenceable(1) %v)

Is it the expected behaviour?