hg: jdk/hs: 8200366: SIGSEGV in CodeHeapState::print_names()

[vladimir.kozlov at oracle.com]

Changeset: c42db4d81e33
Author:    lucy
Date:      2018-03-29 14:53 -0700
URL:       http://hg.openjdk.java.net/jdk/hs/rev/c42db4d81e33

8200366: SIGSEGV in CodeHeapState::print_names()
Summary: Temporary removed the failing function in diagnostic command until investigation is complete. Added checks to validate code blobs.
Reviewed-by: kvn, thartmann

! src/hotspot/share/code/codeHeapState.cpp
! src/hotspot/share/services/diagnosticCommand.cpp