RFR(S): 8205999: C2 compilation fails with "assert(store->find_edge(load) != -1) failed: missing precedence edge"

[Nils Eliasson]

Hi,

This change backs out 8204157 and 8192992 so we get back to the state 
pre 8192992. Total diff is just one line.

This gets us back to a state when the problem only reproduces rarely 
with -XX:+AlwaysInlineIncrementally on x64 and is handled gracefully in 
production builds.

Bug: https://bugs.openjdk.java.net/browse/JDK-8205999

Webrev: http://cr.openjdk.java.net/~neliasso/8205999/webrev.01/

Regards,

Nils