RFR(XS): 8232616: JVMCI_lock fails to get initialized when cds is disabled

[Jie Fu]

Hi all,

JBS:    https://bugs.openjdk.java.net/browse/JDK-8232616
Webrev: http://cr.openjdk.java.net/~jiefu/8232616/webrev.00/

When cds was disabled, many tests in compiler/aot and compiler/jvmci 
crashed due to SIGSEGV in Mutex::unlock().
For the list of failing tests, please refer to the JBS.

The reason for these crashes is that JVMCI_lock fails to get initialized 
when cds is disabled [1].

I suggest to fix this bug since aot and jvmci seem not to be dependent 
on cds.
Could you please review it and give me some advice?

Testing:
  - The list of failing tests due to this bug  on Linux/x64
  - make test TEST="tier1" CONF=server-release on Linux/x64

Thanks a lot.
Best regards,
Jie

[1] 
http://hg.openjdk.java.net/jdk/jdk/file/2e0462f4cf4e/src/hotspot/share/runtime/mutexLocker.cpp#l339