RFR: 8282240: Add _name field to Method for NOT_PRODUCT only [v3]

[Coleen Phillimore]

> Whenever I'm debugging I really wish I knew the name of the method that I'm looking at, so I added this field in not-product.
> Tested with tier1 on Oracle platforms.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Set _name field in constructor with available symbol rather than later when constant pool pointer is set.  I like this one better.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7608/files
  - new: https://git.openjdk.java.net/jdk/pull/7608/files/ab762ed7..f75cf1e2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7608&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7608&range=01-02

  Stats: 43 lines in 5 files changed: 28 ins; 7 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7608.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7608/head:pull/7608

PR: https://git.openjdk.java.net/jdk/pull/7608