One fix in the asm statement parser to stop parsing if the end of the
statement has been reached, and moves all inline asm tests to gdc.dg.
These being adjusted where necessary to test the GCC style instead.

gcc/testsuite/ChangeLog:

2019-01-14  Iain Buclaw  <ibuclaw@gdcproject.org>

	* gdc.dg/asm1.d: New test.
	* gdc.dg/asm2.d: New test.
	* gdc.dg/asm3.d: New test.
	* gdc.dg/asm4.d: New test.
	* lib/gdc.exp (gdc_init): Set gcc_error_prefix and gcc_warning_prefix.

From-SVN: r267913