Disable toll-free bridging for CFRunLoopTimer

Foundation.Timer is not currently implemented with a compatible memory layout
so attempt to bridge these classes will fail. Disabling bridging allows
code using CFRunLoopTimer to work until Foundation.Timer is reimplemented.
Fixes https://bugs.swift.org/browse/SR-10465

Author: tokyovigilante

CoreFoundation/RunLoop.subproj/CFRunLoop.c

@@ -4306,7 +4306,7 @@ CFIndex CFRunLoopTimerGetOrder(CFRunLoopTimerRef rlt) {
 
 void CFRunLoopTimerInvalidate(CFRunLoopTimerRef rlt) {	/* DOES CALLOUT */
     CHECK_FOR_FORK();
-    CF_OBJC_FUNCDISPATCHV(CFRunLoopTimerGetTypeID(), void, (NSTimer *)rlt, invalidate);
+    //CF_OBJC_FUNCDISPATCHV(CFRunLoopTimerGetTypeID(), void, (NSTimer *)rlt, invalidate);
     __CFGenericValidateType(rlt, CFRunLoopTimerGetTypeID());
     __CFRunLoopTimerLock(rlt);
     if (!__CFRunLoopTimerIsDeallocating(rlt)) {

CoreFoundation/RunLoop.subproj/CFRunLoop.h

@@ -29,7 +29,7 @@ typedef struct CF_BRIDGED_MUTABLE_TYPE(id) __CFRunLoopSource * CFRunLoopSourceRe
 
 typedef struct CF_BRIDGED_MUTABLE_TYPE(id) __CFRunLoopObserver * CFRunLoopObserverRef;
 
-typedef struct CF_BRIDGED_MUTABLE_TYPE(NSTimer) __CFRunLoopTimer * CFRunLoopTimerRef;
+typedef struct /*CF_BRIDGED_MUTABLE_TYPE(id)*/ __CFRunLoopTimer * CFRunLoopTimerRef;
 
 /* Reasons for CFRunLoopRunInMode() to Return */
 typedef CF_ENUM(SInt32, CFRunLoopRunResult) {

Foundation/NSSwiftRuntime.swift

@@ -173,8 +173,8 @@ internal func __CFInitializeSwift() {
     _CFRuntimeBridgeTypeToClass(CFAttributedStringGetTypeID(), unsafeBitCast(NSMutableAttributedString.self, to: UnsafeRawPointer.self))
 //    _CFRuntimeBridgeTypeToClass(CFReadStreamGetTypeID(), unsafeBitCast(InputStream.self, UnsafeRawPointer.self))
 //    _CFRuntimeBridgeTypeToClass(CFWriteStreamGetTypeID(), unsafeBitCast(OutputStream.self, UnsafeRawPointer.self))
-   _CFRuntimeBridgeTypeToClass(CFRunLoopTimerGetTypeID(), unsafeBitCast(Timer.self, to: UnsafeRawPointer.self))
-    
+   //_CFRuntimeBridgeTypeToClass(CFRunLoopTimerGetTypeID(), unsafeBitCast(Timer.self, to: UnsafeRawPointer.self))
+
     __CFSwiftBridge.NSObject.isEqual = _CFSwiftIsEqual
     __CFSwiftBridge.NSObject.hash = _CFSwiftGetHash
     __CFSwiftBridge.NSObject._cfTypeID = _CFSwiftGetTypeID

Foundation/Timer.swift

@@ -16,9 +16,7 @@ internal func __NSFireTimer(_ timer: CFRunLoopTimer?, info: UnsafeMutableRawPoin
 }
 
 open class Timer : NSObject {
-    typealias CFType = CFRunLoopTimer
-    
-    internal var _cfObject: CFType {
+    internal var _cfObject: CFRunLoopTimer {
         get {
             return _timer!
         }