[Debugging] Disable use of DebugDescriptionMacro when bootstrapping is off (#71820)

Author: kastiglione

stdlib/public/core/CMakeLists.txt

@@ -261,7 +261,7 @@ if(SWIFT_STDLIB_ENABLE_VECTOR_TYPES)
 endif()
 
 # Freestanding and Linux builds both have failures to resolve.
-if(NOT SWIFT_FREESTANDING_FLAVOR AND NOT SWIFT_HOST_VARIANT_SDK STREQUAL "LINUX")
+if(NOT BOOTSTRAPPING_MODE STREQUAL "OFF" AND NOT SWIFT_FREESTANDING_FLAVOR AND NOT SWIFT_HOST_VARIANT_SDK STREQUAL "LINUX")
   list(APPEND SWIFTLIB_SOURCES ObjectIdentifier+DebugDescription.swift)
 endif()