[Chapel Merge] Use smaller problem size for vectorization codegen test

Branch: refs/heads/main
Revision: 0852d983b1d365a2a75c0dbc3c2cfcdb6b38442d
Author: jabraham17
Link: Use smaller problem size for vectorization codegen test by jabraham17 · Pull Request #28993 · chapel-lang/chapel · GitHub
Log Message:
Use smaller problem size for vectorization codegen test (#28993)

Switches a test to use a much smaller problem size.

This test is for checking we properly vectorize certain patterns, which
is done statically based on the generated code (so the loop trip count
really doesn't matter). The previous problem size was way too big (10+
gigs), and a new test machine with a smaller memory was timing out while
running it.

I also fixed some other issues with the test I noticied

[Not reviewed - trivial]

Compare: Comparing 6f8628ef7d9365e74622a0ba3521e7913cd2c9d2...0f63ac9376aa1e8ae789d01c6c61937f0cc5b5cf · chapel-lang/chapel · GitHub

Diff:
M test/llvm/vectorization/nested_loop.chpl
https://github.com/chapel-lang/chapel/pull/28993.diff