[RFR] fix crash "guarantee(sect->end() <= tend) failed: sanity"

[Sergey Nazarkin]

BTW, Ed, do we need create new bug at jbs? 



> On Jun 14, 2019, at 21:10, Edward Nevill <edward.nevill at gmail.com> wrote:
> 
> Looks good,
> 
> Thanks,
> Ed.
> 
> On Fri, 2019-06-14 at 17:19 +0000, Sergey Nazarkin wrote:
>> Hi,
>> 
>> please review the fix for the crash caused by arch-specific patch for "8176100: [aarch32] [REDO][REDO] G1 Needs pre barrier on dereference of weak JNI handles”. 
>> 
>> New instruction was added to src/cpu/aarch32/vm/jniFastGetField_aarch32.cpp without code buffer expansion http://hg.openjdk.java.net/aarch32-port/jdk8u/hotspot/rev/2a07e209249a#l1.8
>>