This patch aims to address the TODO for handling character conversion in HLFIR found [here](1defa78124/flang/lib/Lower/ConvertExprToHLFIR.cpp (L1388)) using [this similar operation but for FIR as inspiration](3ea673a97b/flang/lib/Lower/ConvertExpr.cpp (L1212-L1271)). Reviewed By: vzakhari, tblah Differential Revision: https://reviews.llvm.org/D155650