Erik Eckstein 666c5e087c stdlib: enable COW sanity checks with an environment variable ...

Instead of doing the sanity checks by default (with an assert-build of the stdlib), only do the checks if the environment variable SWIFT_DEBUG_ENABLE_COW_SANITY_CHECKS is set to true.

The checks can give false alarms in case a binary is built against a no-assert stdlib but run with an assert-stdlib.
Therefore only do the checks if it's explicitly enabled at runtime.

rdar://problem/65475776

2020-07-20 11:23:42 +02:00

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