RFR: 8267982: Set the node after peephole optimization to be removed [v3]

[SUN Guoyun]

> Hi all,
> 
> Enable peephole can cause SIGSEGV sometimes in OopFlow::build_oop_map(Node*, int, PhaseRegAlloc*, int*)+0x238 , so must set a removed-flags for the peephole-nodes , to avoid be set-live-bit() and cause crash.
>  Please review this trivial change.
> 
> Thanks,
> Sun Guoyun

SUN Guoyun has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8267982: Set the node after peephole optimization to be removed

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4276/files
  - new: https://git.openjdk.java.net/jdk/pull/4276/files/e7e943da..b5fc0dc4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4276&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4276&range=01-02

  Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4276.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4276/head:pull/4276

PR: https://git.openjdk.java.net/jdk/pull/4276