RFR: 8365163: [ubsan] left-shift issue in globalDefinitions.hpp [v6]

[Afshin Zafari]

> There was a left-shift of negative value UB in `set_high` function where the high value sign bit is on and is left-shifted 32 bits to put it in high word of the destination address.
> To address it, first the left 32 bits of the provided `high` arg is cleared and then left-shifted 32 bits. 
> 
> Tests:
> mach5 tiers 1-5 {macosx-aarch64, linux-x64, windows-x64} x {debug, product}

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

  used CONST64 for all 64-bits const terms.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26809/files
  - new: https://git.openjdk.org/jdk/pull/26809/files/e6ee02ff..dc273d02

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26809&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26809&range=04-05

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/26809.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26809/head:pull/26809

PR: https://git.openjdk.org/jdk/pull/26809