When generating code for functions that have `__builtin_frame_address`
calls and `noinline` attribute, prologue was not emitted correctly
leading to an assertion failure in PowerPC. The issue was due to
improper insertion of prologue for a function that contain llvm
`__builtin_frame_address`.
Shrink-wrap pass computes the save and restore points of a function.
Default points are the entry and exit points of the function. During
shrink-wrapping the frame-pointer was not honored like the stack pointer
and it was considered as a callee-saved register. This change will treat
the FP similar to SP and will insert the prolog on top the instruction
containing FP.
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Co-authored-by: Tony Varghese <tony.varghese@ibm.com>
This is NFC patch to capture the insertion of prologue and epilogue by
`shrinkwrap` pass for Powerpc target for functions that contain llvm
`__builtin_frame_address`.
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Co-authored-by: Tony Varghese <tony.varghese@ibm.com>
