[Bug 207359] projects/clang380-import for TARGET_ARCH=powerpc64 via powerpc64-gcc : c++ exceptions unbounded loop in _Unwind_RaiseException (9 line program)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207359

--- Comment #7 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #6)

I have verified that dwarfdump and its libdwarf do save and restore the
following for the cfa for DW_CFA_remember_state/DW_CFA_restore_state:

A) Of the offset is relevant or not (if it has a offset style rule)

B) the rule-value type

C) the register number that the cfa is based on

D) the offset or block length by naming conventions

E) the block pointer

I do not claim that all that applies to the mostly dwarf2 FreeBSD context. But
I expect that (A)-(D) apply, (D) just for the offset case.

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