load_bytecode only accepts ascii filenames

[pmichaud]

Here's the test case:

$ cat x1.pir
.sub 'load' :load
    say 'hello from x1.pir'
.end

$ cat x2.pir
.sub 'main'
    $S0 = iso-8859-1:"x1.pir"
    load_bytecode $S0
.end

$ ./parrot x2.pir
Cross-charset index not supported
current instr.: 'main' pc 3 (x2.pir:3)
$

The exception comes from ascii_cs_rindex, which doesn't like searching for a trailing '/' in a non-ascii string.

Pm

[NotFound]

I've made a quick fix in r35974, replacing the CONST_STRING used for the checks with a string_make using the charset of the string to be checked. This must be reworked when the string reworking is ready.