ARC bug with objc_precise_lifetime and ternary operator

% clang -v
Apple LLVM version 5.0 (clang-500.2.75) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin12.4.0
Thread model: posix

% cat testARC.m
#import <Foundation/Foundation.h>

static BOOL gSomeValue;

static BOOL DoSomeCheck(void)
{
  return gSomeValue;
}

@interface Scoped : NSObject
@end

@implementation Scoped

- (instancetype)init
{
  self = [super init];
  NSLog(@"%s %@", __func__, self);
  return self;
}

- (void)dealloc
{
  NSLog(@"%s %@", __func__, self);
}

@end

int main(int argc, char **argv)
{
  gSomeValue = YES;

  {
    __attribute__((objc_precise_lifetime)) Scoped *scoped = [[Scoped alloc] init];
    NSLog(@"At the end of first block");
  }

  {
    __attribute__((objc_precise_lifetime)) Scoped *scoped = DoSomeCheck() ? [[Scoped alloc] init] : nil;
    NSLog(@"At the end of second block");
  }

  {
    Scoped *scopeMe = DoSomeCheck() ? [[Scoped alloc] init] : nil;
    __attribute__((objc_precise_lifetime)) Scoped *scoped = scopeMe;
    NSLog(@"At the end of third block");
  }
}

% clang -fobjc-arc -O0 -o testARC-dbg ./testARC.m
% clang -fobjc-arc -Os -o testARC-opt ./testARC.m

% ./testARC-dbg
2013-11-01 16:53:27.387 testARC-dbg[85843:707] -[Scoped init] <Scoped: 0x7f9102c081c0>
2013-11-01 16:53:27.389 testARC-dbg[85843:707] At the end of first block
2013-11-01 16:53:27.389 testARC-dbg[85843:707] -[Scoped dealloc] <Scoped: 0x7f9102c081c0>
2013-11-01 16:53:27.390 testARC-dbg[85843:707] -[Scoped init] <Scoped: 0x7f9103b009d0>
2013-11-01 16:53:27.390 testARC-dbg[85843:707] At the end of second block
2013-11-01 16:53:27.390 testARC-dbg[85843:707] -[Scoped dealloc] <Scoped: 0x7f9103b009d0>
2013-11-01 16:53:27.391 testARC-dbg[85843:707] -[Scoped init] <Scoped: 0x7f9102c02b40>
2013-11-01 16:53:27.408 testARC-dbg[85843:707] At the end of third block
2013-11-01 16:53:27.412 testARC-dbg[85843:707] -[Scoped dealloc] <Scoped: 0x7f9102c02b40>

% ./testARC-opt
2013-11-01 16:53:13.479 testARC-opt[85825:707] -[Scoped init] <Scoped: 0x7ff758c081a0>
2013-11-01 16:53:13.484 testARC-opt[85825:707] At the end of first block
2013-11-01 16:53:13.485 testARC-opt[85825:707] -[Scoped dealloc] <Scoped: 0x7ff758c081a0>
2013-11-01 16:53:13.486 testARC-opt[85825:707] -[Scoped init] <Scoped: 0x7ff759b00470>
2013-11-01 16:53:13.486 testARC-opt[85825:707] -[Scoped dealloc] <Scoped: 0x7ff759b00470>
2013-11-01 16:53:13.487 testARC-opt[85825:707] At the end of second block
2013-11-01 16:53:13.489 testARC-opt[85825:707] -[Scoped init] <Scoped: 0x7ff759900140>
2013-11-01 16:53:13.489 testARC-opt[85825:707] At the end of third block
2013-11-01 16:53:13.490 testARC-opt[85825:707] -[Scoped dealloc] <Scoped: 0x7ff759900140>