[Bug target/79793] Incorrect stack alignment for interrupt handler in 64-bit

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79793
Bug 79793 depends on bug 81570, which changed state.

Bug 81570 Summary: create_pseudo_cfg assumes that INCOMING_FRAME_SP_OFFSET is a 
constant
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81570

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE