Fix =breakpoint-created event after creation of BP (MI)

For example:
was:
```
$ bin/lldb-mi ~/p/hello
[...]
-break-insert main
^done,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x0000000100000e2d",func="main",file="hello.cpp",fullname="/Users/IliaK/p/hello.cpp",line="14",times="0",original-location="main"}
(gdb)
=breakpoint-modified,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x0000000100000e2d",func="main",file="hello.cpp",fullname="/Users/IliaK/p/hello.cpp",line="14",times="0",original-location="main"}
```

now:
```
$ bin/lldb-mi ~/p/hello
[...]
-break-insert main
^done,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x0000000100000e2d",func="main",file="hello.cpp",fullname="/Users/IliaK/p/hello.cpp",line="14",times="0",original-location="main"}
(gdb)
=breakpoint-created,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x0000000100000e2d",func="main",file="hello.cpp",fullname="/Users/IliaK/p/hello.cpp",line="14",times="0",original-location="main"}
```

llvm-svn: 236837