Runtimes: rename Core/core to Core/Core (uppercase C) so it appears...

higher in case sensitive directory listings (like GitHub).

This will ease checking for stdlib code on small screens without needing
to scroll.

Git should take care of changing the case even on case insensitive file
systems -- to be on the safe side, have the resync script rename the
folder in the case the update of the sources alone does not take care
of this, so we don't have errors when invoking the Runtime build system
(since CMake considers paths as case sensitive regardless of the
underlying file system).

Addresses rdar://164195263

Author: edymtt

Runtimes/Core/CMakeLists.txt

@@ -206,7 +206,7 @@ add_subdirectory(Demangling)
 add_subdirectory(Threading)
 add_subdirectory(runtime)
 add_subdirectory(stubs)
-add_subdirectory(core)
+add_subdirectory(Core)
 if(SwiftCore_ENABLE_COMMANDLINE_SUPPORT)
   add_subdirectory(CommandLineSupport)
 endif()

Runtimes/Core/core/CMakeLists.txt renamed to Runtimes/Core/Core/CMakeLists.txt

@@ -86,7 +86,6 @@ set(CoreLibs
   CompatibilityOverride
   stubs
   CommandLineSupport
-  core
   SwiftOnoneSupport
   RemoteInspection
   SwiftRemoteMirror
@@ -97,6 +96,16 @@ foreach(library ${CoreLibs})
   copy_library_sources(${library} "public" "Core")
 endforeach()
 
+# copying Core/core separately, so we can amend the case of the target folders
+# on case insensitive file systems
+if(IS_READABLE "${CMAKE_CURRENT_LIST_DIR}/Core/core")
+  message(STATUS "Renaming ${CMAKE_CURRENT_LIST_DIR}/Core/core (lowercase) to ${CMAKE_CURRENT_LIST_DIR}/Core/Core (uppercase)")
+  file(RENAME "${CMAKE_CURRENT_LIST_DIR}/Core/core" "${CMAKE_CURRENT_LIST_DIR}/Core/core.casechange")
+  file(RENAME "${CMAKE_CURRENT_LIST_DIR}/Core/core.casechange" "${CMAKE_CURRENT_LIST_DIR}/Core/Core")
+endif()
+copy_library_sources("" "public/core" "Core/Core")
+
+
 message(STATUS "plist[${StdlibSources}/Info.plist.in] -> Core/Info.plist.in")
 copy_files("" "Core" FILES "Info.plist.in")