RFR: 8292983: ModuleReferenceImpl.computeHash should record algorithm for cache checks [v4]

[Aleksey Shipilev]

> Look at implementation and figure out what happens if you do:
> 
> 
>  computeHash("SHA-1") = someHash;
>  computeHash("SHA-256") = ...?
> 
> 
> The caching method should actually check the algorithms match.
> 
> Not a bug at this point, since only use SHA-256 today, but this is a landmine ready to fire. 
> 
> Additional testing:
>  - [x] Linux x86_64 release, `java/lang/module` tests

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10044/files
  - new: https://git.openjdk.org/jdk/pull/10044/files/4cd7399e..f3eb926d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10044&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10044&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10044.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10044/head:pull/10044

PR: https://git.openjdk.org/jdk/pull/10044