RFR: 8361499: Intersection type cast causes javac crash with -Xjcov [v2]

[Vicente Romero]

> After TransTypes decomposes an intersection type in its components, there is no point keeping the intersection AST around. This could lead to errors in the backend. This PR is proposing lowering the intersection AST to it's first component,
> 
> TIA

Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:

  minor change

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26203/files
  - new: https://git.openjdk.org/jdk/pull/26203/files/ccee3c67..cffcaee1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26203&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26203&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26203.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26203/head:pull/26203

PR: https://git.openjdk.org/jdk/pull/26203