[6.0][Runtime] Allow disabling/enabling prespecializations library per-process. #72980
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Cherry-pick #72958 to
release/6.0
.Read a list of disabled process names from the prespecializations library, and turn the feature off if the current process matches. Also allow passing process names in environment variables. Processes can be disabled by name using SWIFT_DEBUG_LIB_PRESPECIALIZED_DISABLED_PROCESSES, and a disable can be overridden with SWIFT_DEBUG_LIB_PRESPECIALIZED_ENABLED_PROCESSES.
rdar://126216786