Merge pull request swiftlang#83838 from edymtt/edymtt/reinstate-dependency-from-stdlibunittest-to-stringprocessing

CMake: readd StringProcessing dependency to StdlibUnittest

Author: edymtt

stdlib/private/StdlibUnittest/CMakeLists.txt

@@ -37,6 +37,9 @@ if (SWIFT_ENABLE_EXPERIMENTAL_CONCURRENCY)
   list(APPEND swift_stdlib_unittest_link_libraries "swift_Concurrency")
   list(APPEND swift_stdlib_unittest_modules "_Concurrency")
 endif()
+if (SWIFT_ENABLE_EXPERIMENTAL_STRING_PROCESSING)
+  list(APPEND swift_stdlib_unittest_modules "_StringProcessing")
+endif()
 
 add_swift_target_library(swiftStdlibUnittest ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_STDLIB
   # This file should be listed the first.  Module name is inferred from the