[16] RFR(S): 8248234: Disabling UseExactTypes crashes C2

[Tobias Hartmann]

Hi,

please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8248234
http://cr.openjdk.java.net/~thartmann/8248234/webrev.00/

Turning off UseExactTypes triggers all kinds of asserts in C2. Since the flag is also completely
untested and obviously hasn't been used in many years, I propose to remove it.

Thanks,
Tobias