RFR: 8277102: Dubious PrintCompilation output

[Yi Yang]

The output of PrintCompilation is ill-formed:


     22 1 3 java.lang.Object::<init> (1 bytes)
     25 2 3 java.lang.String::hashCode (60 bytes)
     25 3 3 java.lang.String::coder (15 bytes)
     27 4 3 Reduced::foo (12 bytes)
     27 5 3 java.lang.Boolean::valueOf (14 bytes)
     27 6 3 java.lang.Boolean::hashCode (8 bytes)
     27 8 4 Reduced::foo (12 bytes)
     27 7 2 java.lang.Boolean::hashCode (14 bytes)
   4 3 Reduced::foo (12 bytes) made not entrant
     29 9 % 3 Reduced::main @ 4 (33 bytes)
     29 10 3 Reduced::main (33 bytes)
     29 11 % 4 Reduced::main @ 4 (33 bytes)
   9 % 3 Reduced::main @ 4 (33 bytes) made not entrant
  11 % 4 Reduced::main @ 4 (33 bytes) made not entrant


This seems related to [JDK-8272586](https://bugs.openjdk.java.net/browse/JDK-8272586), which print timestamp optionally. As #5446 mentioned, printing timestamp would break DisassembleCodeBlobTest.java since it expects disassembling a given nmethod twice to produce the same result. Maybe we should fix DisassembleCodeBlobTest.java.

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Commit messages:
 - 8277102 Dubious PrintCompilation output

Changes: https://git.openjdk.java.net/jdk/pull/6386/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6386&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277102
  Stats: 19 lines in 4 files changed: 9 ins; 2 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6386.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6386/head:pull/6386

PR: https://git.openjdk.java.net/jdk/pull/6386