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by introducing new primop 'is_unicode'
with no exception (ab)use and no GC.
Replaces bs_validate_unicode which is kept for backward compat for now.
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This feature was previously missing and expressions such as
<<<<1:1>>/binary>> would succeed construction when compiled with HiPE.
A primop is_divisible is introduced to handle the case when the unit
size is not a power of two.
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Seen symptom: Hipe compiled code with <<C/utf8, ...>> = Bin does sometimes
not match even though Bin contains a valid utf8 character. There might be
other possible binary matching symptoms, as the problem is not utf8
specific.
Problem: A writable binary was not "emasculated" when the matching started
(as it should) by the hipe compiled code.
Fix: Add a new primop emasculate_binary(Bin) that is called when
a matchstate is created.
ToDo: There are probably room for optimization. For example only call
emasculate_binary if ProcBin.flags is set.
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