The commit in [1] changes the behavior of the Arm backend for the
attribute frame-pointer=all. Before [1], leaf functions marked with
frame-pointer=all were not emitting the frame-pointer.
After [1], frame-pointer=all started generating frame pointer for all
functions, including leaf functions.
However, the default behavior for the driver in clang is to emit the
command line option `-mframe-pointer=all` on Arm, if no options for
handling the frame pointer is specified at command line. This causes
observable regressions.
This patch addresses these regressions by configuring the driver so
to emit `-mframe-pointer=non-leaf` when targeting Arm.
Codegen tests dealing with frame pointer generation have been extended
to handle functions with a tail call, since this configuration was
missing.
[1] 4a2bd78f5b0d0661c23dff9c4b93a393a49dbf9a
f82023d72e