RFR: 8292625: jshell crash on "var a = a" [v2]

[Bo Zhang]

> This commit adds the missing `type` assignment after attributing a variable's initial value. In some cases, this issue causes an NPE.
> 
> This issue has existed for a long time, but the NPE was swallowed until https://github.com/openjdk/jdk/commit/433394203dce55db95caefcb57bac9ec114ebc47 stopped swallowing such exceptions.

Bo Zhang has updated the pull request incrementally with one additional commit since the last revision:

  Remove unnecessary space

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/11263/files
  - new: https://git.openjdk.org/jdk/pull/11263/files/dffd32b8..5c58e847

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11263&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11263&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11263.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11263/head:pull/11263

PR: https://git.openjdk.org/jdk/pull/11263