When folding param for loops, use int64_t for indices instead of int
When folding param for loops, use int64_t for indices instead of int

This fixes a problem when the Chapel compiler is built with the Pathscale
compiler on XT in which a param for loop could cause the compiler to
incorrectly go into a very long loop.


git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@15391 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

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