sinput.ads, sinput.adb (Build_Location_String): Take a parameter instead of using...

sinput.ads, sinput.adb (Build_Location_String): Take a parameter instead of using a global variable.

2016-04-18  Bob Duff  <duff@adacore.com>

	* sinput.ads, sinput.adb (Build_Location_String): Take a
	parameter instead of using a global variable.  The function
	version no longer destroys the Name_Buffer.
	* stringt.ads, stringt.adb (String_From_Name_Buffer): Take a
	parameter, which defaults to the Global_Name_Buffer, so some
	calls can avoid the global.
	* exp_ch11.adb, exp_intr.adb: Use new interfaces above
	to avoid using globals. All but one call to Build_Location_String
	avoids the global. Only one call to String_From_Name_Buffer
	avoids it.

From-SVN: r235126