[BUGS] BUG #14615: ReplicationOriginShmemInit Memory access cross-border

The following bug has been logged on the website:

Bug reference:      14615
Logged by:          bret shao
Email address:      bret.shao@outlook.com
PostgreSQL version: 9.6.2
Operating system:   linux
Description:

MemSet(replication_states, 0, ReplicationOriginShmemSize()); in function
ReplicationOriginShmemInit cause cross-border,because that start address of
the share memory allocated is replication_states_ctl, but call MemSet to
initialize this memory start from replication_states which is variable
states's address in struct ReplicationStateCtl.so call MemSet to set 0 with
the total size of this share memory will cross border of this share memory.

Although, this cross-border will not caused the system failure due to share
memory allocation strategy after my analysis. but i still believe we
shouldn't do like this.

Fix suggestion: 
change to MemSet(replication_states_ctl, 0, ReplicationOriginShmemSize()); then move
to the beginning of if statement.


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