RFR: 8275638: GraphKit::combine_exception_states fails with "matching stack sizes" assert [v2]

[Roland Westrelin]

> Root cause is identical to 8273165 AFIU: late inline of a virtual call
> can throw from 2 different paths (null check and the call
> itself). That breaks because the logic for exceptions expects the
> stack for all paths that throw exceptions to have the same stack size.
> 
> AFAIU, the stack doesn't matter exception handling: either the
> exception is caught by a exception handler and then the stack is
> popped and the exception is pushed or, the exception is rethrown to
> the caller in which case the current stack is also popped (that is the
> jvm state for the current method). As a consequence the fix I propose
> is to ignore the stack in GraphKit::combine_exception_states().
> 
> AFAIU, the same fix would work for 8273165 but I left the current work
> around as is: not sure if we want to be conservative for now or not

Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:

  make test runnable with release build

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6572/files
  - new: https://git.openjdk.java.net/jdk/pull/6572/files/f843e27e..e3a04acd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6572&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6572&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6572.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6572/head:pull/6572

PR: https://git.openjdk.java.net/jdk/pull/6572