scanasm.exp (dg-function-on-line): Always use a special format for all mips targets.

2012-01-03  Andrew Pinski  <apinski@cavium.com>

	* lib/scanasm.exp (dg-function-on-line): Always use a special format
	for all mips targets.  Also allow an optional .cfi_startproc.

From-SVN: r182855