Runtimes: use -enable-experimental-concise-pound-file only for Core.

As per #32700, this is only meant for `Swift.swiftinterface`.

Addresses rdar://143152066

Author: edymtt

Runtimes/Core/CMakeLists.txt

@@ -174,7 +174,6 @@ add_compile_options(
   # 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>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -disable-implicit-string-processing-module-import>"

Runtimes/Core/core/CMakeLists.txt

@@ -274,6 +274,9 @@ if(APPLE AND BUILD_SHARED_LIBS)
 endif()
 
 target_compile_options(swiftCore PRIVATE
+  # STAGING: Temporarily avoids having to write #fileID in Swift.swiftinterface.
+  # see also 327ea8bce2d1107a847d444651b19ca6a2901c9e
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -enable-experimental-concise-pound-file>"
   $<$<COMPILE_LANGUAGE:Swift>:-parse-stdlib>
   $<$<COMPILE_LANGUAGE:Swift>:-nostdimport>
   $<$<COMPILE_LANGUAGE:Swift>:-explicit-module-build>