RFR: 8278125: Some preallocated OOMEs are missing stack trace [v5]

[Yi Yang]

> Our customer found that the PreallocatedOutOfMemoryErrorCount is 4 by default. It ought to pre-allocate 4 OOMEs with stack trace, but in fact, no matter how many OOMEs are thrown, only 2 OOMEs have proper stack trace. This is because PreallocatedOutOfMemoryErrorCount is consumed multiple times:
> 
> VM tries to allocate a huge object while Java heap is insufficient to accommodate, it goes to:
> 
> https://github.com/openjdk/jdk/blob/b79554bb5cef14590d427543a40efbcc60c66548/src/hotspot/share/gc/shared/memAllocator.cpp#L115-L136
> 
> Line 135(`Universe::out_of_memory_error_java_heap`->`Universe::gen_out_of_memory_error`) and line 136(`THROW_OOP_`->`Exceptions::_throw`->`Exceptions::count_out_of_memory_exceptions`->`Universe::out_of_memory_error_java_heap`->`Universe::gen_out_of_memory_error`) call `Universe::gen_out_of_memory_error` twice in a single OOM event, which leads this unexpected scenario. Proposed fix is to remove such call in `Exceptions::count_out_of_memory_exceptions`.
> 
> Thanks.

Yi Yang has updated the pull request incrementally with two additional commits since the last revision:

 - typo
 - cleanup

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6672/files
  - new: https://git.openjdk.java.net/jdk/pull/6672/files/b3f0e0e3..a05703b9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6672&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6672&range=03-04

  Stats: 15 lines in 3 files changed: 4 ins; 8 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6672.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6672/head:pull/6672

PR: https://git.openjdk.java.net/jdk/pull/6672