RFR: 8256986: [PPC64] C2 crashes when accessing nonexisting jvms of CallLeafDirectNode [v2]

[Martin Doerr]

> observe_safepoint() is called with jvms == NULL from fill_buffer with mach = CallLeafDirectNode.
> That node represents a leaf call and does not safepoint.
> 
> In addition MachCallRuntimeNode::ret_addr_offset() need update for the new assertion in output.cpp.
> This was already fixed on some other platforms.

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Also fix CallDynamicJavaDirectSchedNode. Add assertion.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1418/files
  - new: https://git.openjdk.java.net/jdk/pull/1418/files/8d247269..8ae15b07

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1418&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1418&range=00-01

  Stats: 5 lines in 1 file changed: 4 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1418.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1418/head:pull/1418

PR: https://git.openjdk.java.net/jdk/pull/1418