Update CMakeLists.txt for extension/apple to strip debug symbols path (pytorch#11659)

Author: shoumikhin

extension/apple/CMakeLists.txt

@@ -70,13 +70,14 @@ file(WRITE ${MODULE_MAP_FILE}
 ")
 
 set(SWIFT_CLANG_INTEROP_FLAGS "-Xcc -fmodule-map-file=${MODULE_MAP_FILE} -I ${MODULE_MAP_DIR}")
+set(SWIFT_REMAP_FLAGS "-debug-prefix-map ${PROJECT_SOURCE_DIR}=/executorch")
 
 set_target_properties(extension_apple PROPERTIES
   Swift_MODULE_NAME "ExecuTorch"
-  Swift_FLAGS "${SWIFT_CLANG_INTEROP_FLAGS}"
+  Swift_FLAGS "${SWIFT_CLANG_INTEROP_FLAGS} ${SWIFT_REMAP_FLAGS}"
   XCODE_ATTRIBUTE_SWIFT_MODULE_NAME "ExecuTorch"
   XCODE_ATTRIBUTE_BUILD_LIBRARY_FOR_DISTRIBUTION "YES"
-  XCODE_ATTRIBUTE_OTHER_SWIFT_FLAGS "${SWIFT_CLANG_INTEROP_FLAGS}"
+  XCODE_ATTRIBUTE_OTHER_SWIFT_FLAGS "${SWIFT_CLANG_INTEROP_FLAGS} ${SWIFT_REMAP_FLAGS}"
 )
 
 add_custom_command(