std.debug: fix FP-based unwinding on powerpc64

This just needs to do the same thing as powerpc64le. Note that the saved LR is
at the same position in both ELF v1 and v2.
d8268fac98Alex Rønne Petersen committed on 10/4/2025, 1:03:54 AMparent07c3f9e
1 file changedLine totals unavailable