[14] RFR(S): 8233788: Remove useless asserts in PhaseCFG::insert_anti_dependences

[Tobias Hartmann]

Hi,

please review the following cleanup:
https://bugs.openjdk.java.net/browse/JDK-8233788
http://cr.openjdk.java.net/~thartmann/8233788/webrev.00/

load_alias_idx can never be 0 and even if it could be, one of the asserts would fail because the
opcode check handles only a single type. In fact, all these intrinsic nodes have adr_type() == NULL
which maps to AliasIdxTop.

Thanks,
Tobias