An inflexible regex caused these tests to regress.

2019-05-02  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.dg/tree-prof/section-attr-1.c: Update scan-asm regex
	for cold section label.
	* gcc.dg/tree-prof/section-attr-2.c: Likewise.
	* gcc.dg/tree-prof/section-attr-3.c: Likewise.

From-SVN: r270797