Updated request for reviews (S): 6984348

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6984348/webrev.01

Fixed 6984348: Fix typo in escape.cpp

After fixing typo the assert produces false negative results.
It does not take into account that Loads don't have output
memory edge and Stores may have several memory users.

I removed this code and added few asserts into move_inst_mem().

Tested with CTW and NSK.