[flang] Shift argument attributes when result operand is inserted

The TargetRewrite pass convert the signature of the function.
In some cases it adds operands to the function to hanlde the result of it.
This patch makes sure the argument attributes present before the conversion
are replaced with the correct arguments after the conversion is performed.

Depends D132113

Reviewed By: vdonaldson

Differential Revision: https://reviews.llvm.org/D132114