[fpc-devel] Vectorcall Fix

[J. Gareth Moreton]

 Hi everyone,

 Sorry this took so long.  There was a bug in my "vectorcall" submission
in that if you specified "vectorcall" on a method under Linux (it might
have been specifically a virtual method), it stored Self in RCX instead of
RDI, rather than silently ignoring the Windows-only calling convention.

 Patch is here: https://bugs.freepascal.org/view.php?id=33542

 The fix was surprisingly simple - it was an oversight in the
"x86_64_use_ms_abi" function - all it took was the removal of a single
keyword.

 Compilation was tested under Ubuntu 16.04 (in VirtualBox) and Windows 10
and the vectorcall tests in "tests/test/cg" run without error.

 Gareth aka. Kit
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