[Development] Removing fromUtf8() fallback in QStringLiteral

[Marc Mutz]

Hi,

https://codereview.qt-project.org/185059 proposes to remove support for the 
fromUtf8() fallback of QStringLiteral, so we can finally guarantee that 
QStringLiteral use will not allocate memory and will not throw.

I believe we can get away with it (see comment in change set for details) 
since 5.7 already, so I'd like to propose

1. To have this patch merged for 5.8 instead of dev
2. Failing that, to drop any platform (version) that does not provide
   Q_COMPILER_UNICODE_STRINGS from the supported list of compilers for 5.10.

AFAICT, (2) could only possibly affect ICC and VxWorks.

Thanks,
Marc

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Marc Mutz <marc.mutz at kdab.com> | Senior Software Engineer
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