RFR: 8286990: Add compiler name to warning messages in Compiler Directive [v3]

[Yuta Sato]

> When using Compiler Directive such as `java -XX:+UnlockDiagnosticVMOptions -XX:CompilerDirectivesFile=<CompilerDirectives.json> <Java.class>` ,
> it shows totally the same message for c1 and c2 compiler and the user would be confused about 
> which compiler is affected by this message.
> This should show messages with their compiler name so that the user knows which compiler shows this message.
> 
> My change result would be like the below.
> 
> 
> OpenJDK 64-Bit Server VM warning: printing of assembly code is enabled; turning on DebugNonSafepoints to gain additional output
> OpenJDK 64-Bit Server VM warning: printing of assembly code is enabled; turning on DebugNonSafepoints to gain additional output
> 
> ->
> 
> OpenJDK 64-Bit Server VM warning: c1: printing of assembly code is enabled; turning on DebugNonSafepoints to gain additional output
> OpenJDK 64-Bit Server VM warning: c2: printing of assembly code is enabled; turning on DebugNonSafepoints to gain additional output

Yuta Sato has updated the pull request incrementally with one additional commit since the last revision:

  add const to method

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8591/files
  - new: https://git.openjdk.java.net/jdk/pull/8591/files/64256f06..d1669100

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8591&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8591&range=01-02

  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8591.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8591/head:pull/8591

PR: https://git.openjdk.java.net/jdk/pull/8591