Runtimes: generate optimization record on Darwin

Addresses rdar://143152066

Author: edymtt

Runtimes/Core/CMakeLists.txt

@@ -171,6 +171,9 @@ add_compile_options(
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature Extern>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature ValueGenerics>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature AddressableParameters>"
+  # TODO: we should reevaluate if it still makes sense to restrict this
+  # to Darwin, https://github.com/swiftlang/swift/issues/79279
+  "$<$<AND:$<PLATFORM_ID:Darwin>,$<COMPILE_LANGUAGE:Swift>>:-save-optimization-record=bitstream>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -enable-experimental-concise-pound-file>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -enable-lexical-lifetimes=false>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -disable-implicit-concurrency-module-import>"