Change default roles in hs-boot files. (#9204)

compiler/typecheck/TcRnDriver.hs

compiler/typecheck/TcTyDecls.hs

docs/users_guide/7.12.1-notes.xml

docs/users_guide/separate_compilation.xml

testsuite/tests/rename/should_fail/rnfail055.stderr

testsuite/tests/roles/should_compile/T9204b.hs

testsuite/tests/roles/should_compile/T9204b.hs-boot

testsuite/tests/roles/should_compile/T9204b2.hs

testsuite/tests/roles/should_compile/all.T

testsuite/tests/roles/should_fail/Roles12.stderr

testsuite/tests/roles/should_fail/T9204.stderr

testsuite/tests/typecheck/should_fail/tcfail220.stderr