shadow-stack broken?

Hi,

I have been trying all day long to get the following
5 line file to compile:

test.ll:

declare void @llvm.gcroot (i8**, i8*)

define i32 @main() gc "shadow-stack" {
entry:
   %0 = alloca i8*
   %1 = call i8* @malloc(i64 10)
   store i8* %1, i8** %0
   call void @llvm.gcroot(i8** %0, i8* null)
   ret i32 0
}

declare i8* @malloc (i64)

If I do

llc test.ll

I get

ld: in /var/folders/89/p11x49r14dgd12j0sj1l6jkw0000gn/T//cc2yjCje.o, sectionForAddress(0x5200E00000004CD) address not in any section for architecture x86_64

If anyone knows how to get _any_ function that uses @gcroot and
shadow-stack to compile, that would be great...

Thanks,
N

Seems to work on 3.0svn (http://pastebin.com/UqdJgjsn).