Allow extending qualifiers of function parameters and return values
`header-abi-diff --allow-extensions` allows function parameters to be
more qualified, and return types to be less qualified. The ABI tools
follows the qualifier conversion rules in C++.
The ABI tool only allows extending the qualifiers of the functions that
have corresponding symbols. The qualifiers of the other types, such as
function pointers, class members, and global variables, must be
identical between the old and new ABIs.
Test: ./test.py
Bug: 259148872
Change-Id: I227f6ed774cc88009713acce955e35f1c3cff1ca
13 files changed