Fix up reference to _NSCFConstantString, which comes from Foundation and is defined by the SymbolAliases file

Author: parkera

CoreFoundation/Base.subproj/CFRuntime.c

@@ -208,7 +208,9 @@ bool (*__CFObjCIsCollectable)(void *) = NULL;
 #endif
 #endif
 
-#if !DEPLOYMENT_RUNTIME_SWIFT
+#if DEPLOYMENT_RUNTIME_SWIFT
+// The constant string class reference is set at link time to _NSCFConstantString
+#else
 #if !__CONSTANT_CFSTRINGS__ || DEPLOYMENT_TARGET_EMBEDDED_MINI
 // Compiler uses this symbol name; must match compiler built-in decl, so we use 'int'
 #if __LP64__

CoreFoundation/Base.subproj/DarwinSymbolAliases

@@ -1,6 +1,8 @@
-# OPENSOURCE: REVIEW
 
-__TMdC10Foundation19_NSCFConstantString ___CFConstantStringClassReference
+
+# This is specific to Swift open source; Foundation's NSCFConstantString is used as our constant string class reference
+__TMdC15SwiftFoundation19_NSCFConstantString ___CFConstantStringClassReference
+
 _kCFCalendarIdentifierBuddhist		_kCFBuddhistCalendar
 _kCFCalendarIdentifierChinese		_kCFChineseCalendar
 _kCFCalendarIdentifierGregorian		_kCFGregorianCalendar

CoreFoundation/Base.subproj/SymbolAliases

@@ -1,6 +1,8 @@
-# OPENSOURCE: REVIEW
 
+
+# This is specific to Swift open source; Foundation's NSCFConstantString is used as our constant string class reference
 __TMdC15SwiftFoundation19_NSCFConstantString ___CFConstantStringClassReference
+
 _kCFCalendarIdentifierBuddhist		_kCFBuddhistCalendar
 _kCFCalendarIdentifierChinese		_kCFChineseCalendar
 _kCFCalendarIdentifierGregorian		_kCFGregorianCalendar