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rts: enforce POSIX numeric locale for heap profiles (#17877)

Jean-Baptiste Mazon requested to merge jbm/ghc:prof-locale into master

As per issue #17877: use POSIX locale for LC_NUMERIC when writing to the profiling file, and restore when done.

So my commit:

  • is either individually buildable or squashed
  • has a commit message which describes what it does
  • added source comments describing the change.

Not for that part, I'm afraid. I think the identifiers are explicit enough.

  • adds a testcase to the testsuite

Not yet. Not sure how :-| See issue for why.

  • replace this message with a description motivating your change

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