RFR: 8279317: compiler/jvmci/compilerToVM/DisassembleCodeBlobTest.java assumes immutable code [v3]

[Dean Long]

> This test was failing in loom because of nmethod entry barriers, but there are other reasons why it shouldn't assume immutable code, such as embedded oops and NativeJump::patch_verified_entry().

Dean Long has updated the pull request incrementally with one additional commit since the last revision:

  fix Windows failures

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7781/files
  - new: https://git.openjdk.java.net/jdk/pull/7781/files/9b2f9014..c7a61fa4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7781&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7781&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7781.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7781/head:pull/7781

PR: https://git.openjdk.java.net/jdk/pull/7781