Integrate perlio:

Integrate perlio:

[  9400]
More EBCDIC tweaks:
- one more swash issue &~(0xA0-1) did not do the right thing,
for UTF-EBCDIC where &~(0x80-1) does for UTF-8.
- add "use re 'asciirange'" to make [!-~] etc. work
use it in MIME::QuotedPrint and t/op/regexp.t and t/op/pat.t
- Choose a key for t/op/each.t test which gets encoded.
- Skip utf8decode if this is UTF-EBCDIC.

p4raw-link: @9400 on //depot/perlio: daf0f78e031c718c75590ef9ef573756f805776e

p4raw-id: //depot/perl@9407