[PATCH, d] Committed merge with upstream dmd

[Iain Buclaw]

Hi,

The patch merges the D front-end implementation with dmd upstream 5dd3eccc3.

Aligns the test flags between gcc and upstream, after adding support
to gdc-test.exp to handle extra source and file settings being passed
multiple times.

Regression tested on x86_64-linux-gnu.

Committed to trunk as r270038.

-- 
Iain
---
gcc/testsuite/ChangeLog:

2019-03-30  Iain Buclaw  <ibuclaw@gdcproject.org>

        * gdc.test/gdc-test.exp (gdc-copy-extra): Append copied files to
        cleanup_extra_files.
        (dmd2dg): Copy additional files after test is translated.
        (gdc-do-test): Remove all copied files after test.

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