[libcxx] [test] Fix line endings, avoid unnecessary non-ASCII.

benchmarks/util_smartptr.bench.cpp
Change CRLF to LF.

test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp
Consistently comment "\u20ac" as EURO SIGN, its Unicode name, instead of the actual Unicode character.

test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_type.pass.cpp
Avoid non-ASCII dash.

Fixes D40991.

llvm-svn: 320536