[Chapel Merge] Convert some new ioHintSet.noMmaps to ioHintset.mmap(false)

Branch: refs/heads/main
Revision: 9c0f86b1761c8b32ca48140197ce32641ee31ff3
Author: bradcray
Link: Convert some new ioHintSet.noMmaps to ioHintset.mmap(false) by bradcray · Pull Request #21957 · chapel-lang/chapel · GitHub
Log Message:
Convert some new ioHintSet.noMmaps to ioHintset.mmap(false) (#21957)

[trivial, not reviewed]

This fixes up a few tests that were added in #21786, presumably
developed before noMmap was deprecated, but merged afterwards, in hopes
of not having them fail tonight.

Compare: Comparing 977e6c8422a846f0c452c1d88837cbcefd05fd2b...2f2a7e303c9ade4bc2a4a26ba2f3facb57e70a37 · chapel-lang/chapel · GitHub

Diff:
M test/io/corrado/write_buffering_optimization/dynamic_buffering.chpl
M test/io/corrado/write_buffering_optimization/growing_buff_write.chpl
M test/io/corrado/write_buffering_optimization/large_write.chpl
https://github.com/chapel-lang/chapel/pull/21957.diff