RFR: 8351334: [ubsan] memoryReserver.cpp:552:60: runtime error: applying non-zero offset 1073741824 to null pointer [v8]

[Afshin Zafari]

> The minimum acceptable value was 0 where using it as address was problematic according to UBSAN.
> The acceptable value is changed to 64K.
> 
> Tests:
> linux-x64 tier1

Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:

  subtraction for checking overflow

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26955/files
  - new: https://git.openjdk.org/jdk/pull/26955/files/3dfa9765..d0300291

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26955&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26955&range=06-07

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26955.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26955/head:pull/26955

PR: https://git.openjdk.org/jdk/pull/26955