Fix a regression.

The initial PR llvm#90083 was
reverted as it caused the regression in one of the gfortran tests. This
commit fixes this issue by replacing isIntOrIndex with isInteger which
is the right function to check for integer type.

Author: abidh

flang/lib/Optimizer/Transforms/DebugTypeGenerator.cpp

@@ -42,7 +42,7 @@ DebugTypeGenerator::convertType(mlir::Type Ty, mlir::LLVM::DIFileAttr fileAttr,
                                 mlir::LLVM::DIScopeAttr scope,
                                 mlir::Location loc) {
   mlir::MLIRContext *context = module.getContext();
-  if (Ty.isIntOrIndex()) {
+  if (Ty.isInteger()) {
     return genBasicType(context, mlir::StringAttr::get(context, "integer"),
                         Ty.getIntOrFloatBitWidth(), llvm::dwarf::DW_ATE_signed);
   } else if (Ty.isa<mlir::FloatType>() || Ty.isa<fir::RealType>()) {