[14] RFR (S) 8236000: VM build without C2 fails

[Kim Barrett]

> On Dec 17, 2019, at 10:18 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> 
> https://cr.openjdk.java.net/~kvn/8236000/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8236000
> 
> C2 flags should be checked only when C2 is present. Running debug VM build with JVMCI but without C2 found other issues which were fixed too:
> 
> #  Internal Error (src/hotspot/share/jvmci/jvmci_globals.cpp:121), pid=2398, tid=2403
> #  assert(MaxVectorSizechecked) failed: MaxVectorSize flag not checked
> 
> and
> 
> # Internal Error (src/hotspot/share/gc/serial/genMarkSweep.cpp:98), pid=10108, tid=10118
> # assert(DerivedPointerTable::is_active()) failed: Sanity
> 
> Tested build with --with-jvm-features=-compiler2 and --with-jvm-features=-compiler2,-jvmci
> and tier1.
> 
> Thanks,
> Vladimir

Looks good.