test: Add UNICODE_NAMES directive to files with utf-8 symbols

[ibuclaw]

Files containing symbols with unicode characters in their name might not be supported on some specific platforms. For example, the Solaris assembler lacks support for UTF-8 characters.

Assembler: mangle.d
        "/var/tmp//cci9q2Sc.s", line 115 : Syntax error
        Near line: "    movzbl  test_эльфийские_письмена_9, %eax"
Assembler: testmodule.d
        "/var/tmp//ccBtixAd.s", line 3 : Syntax error
        Near line: "    .globl  _D3run17unicode_06_哪里6哪里FiZi"
Assembler: ufcs.d
        "/var/tmp//ccodJ7Ib.s", line 6662 : Syntax error
        Near line: "    .globl  _D4ufcs6α8503FiZv"

Add a new directive which can be used by other testsuite runners as a hint to selectively disable the test if they know they can't compile this ahead of time.

[dlang-bot]

Thanks for your pull request, @ibuclaw!

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#16136"

[ibuclaw]

This test already has a //UTF-8 chars comment here: https://github.com/dlang/dmd/pull/16136/files#diff-76a096d23b36bb26ba1e9a687500e3b2733abf078b8d7edfd7b143c72330544eL46-R48

[ibuclaw]

This is instead of encoding unicode characters in a special way in dmangle.d - similar to how floating point values are encoded.

https://issues.dlang.org/show_bug.cgi?id=19418