RFR: 8332697: ubsan: shenandoahSimpleBitMap.inline.hpp:68:23: runtime error: signed integer overflow: -9223372036854775808 - 1 cannot be represented in type 'long int' [v3]

[Henry Lin]

> Cast the result of `nth_bit(n)` to `uintptr_t` to prevent signed integer overflow error reported by `ubsan`. Unsigned overflow is not undefined behavior and is not checked by `ubsan`.

Henry Lin has updated the pull request incrementally with one additional commit since the last revision:

  revert right_n_bits and add unsigned right_n_bits to shenandoahSimpleBitMap.hpp

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20164/files
  - new: https://git.openjdk.org/jdk/pull/20164/files/75d921cc..f2011961

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20164&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20164&range=01-02

  Stats: 13 lines in 4 files changed: 6 ins; 1 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/20164.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20164/head:pull/20164

PR: https://git.openjdk.org/jdk/pull/20164