Small change to prediff script
Small change to prediff script

My original prediff script hard-coded the name of the .tmp file rather
than using the $2 argument -- this was both fragile (if the .tmp
filename changed) and problematic (if for some reason the test was
failing and the test system was comparing against the execution .tmp
file rather than the compilation tmp file).



git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@16561 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

CoryMcCartan/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,hildeth/chapel,sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,chizarlicious/chapel,chizarlicious/chapel,hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,sungeunchoi/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,sungeunchoi/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,CoryMcCartan/chapel