New tests for parallel compilation feature

Adds new tests for testing the parallel compilation engine.
They mainly test issues with regard to symbol promotion clash and
incorrect early assembler output.

2020-08-20  Giuliano Belinassi  <>

	* gcc.dg/parallel-early-constant.c: New test.
	* gcc.dg/parallel-static-1.c: New test.
	* gcc.dg/parallel-static-2.c: New test.
	* gcc.dg/parallel-static-clash-1.c: New test.
	* gcc.dg/parallel-static-clash-aux.c: New test.
5 files changed