[MERGE] Revert BEGIN { caller() } fixups

These commits were intended to fix a problem with stack backtraces
reporting wrong file and line numbers in nested use's.

A side-effect of the commits was to fix the package name returned by
caller() too; but quite a few distributions were relying on the old
behaviour.

So for now, revert to the old behaviour and re-address after 5.32.0 is
released.

The reverted commits are:

v5.31.6-141-gf2f32cd638 avoid identical stack traces
v5.31.9-122-gee428a211d docs: clarify effect of $^H, %^H, ${^WARNING_BITS}
v5.31.9-162-gad89278aa2 fixup to "avoid identical stack traces" - try 2

0 files changed, 0 insertions, 0 deletions