hg: kulla/dev/langtools: Preserve identity of Snippet even when redefined or replaced by the internal dependency crawl.

[robert.field at oracle.com]

Changeset: 1c56f509062a
Author:    rfield
Date:      2015-02-04 22:04 -0800
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/1c56f509062a

Preserve identity of Snippet even when redefined or replaced by the internal dependency crawl.

! repl/TODO
! repl/src/impl/EvaluationStateImpl.java
! repl/src/impl/JDIExecution.java
+ repl/src/impl/Snip.java
! repl/src/impl/SnippetMaps.java
- repl/src/impl/SnippetSource.java
! repl/src/impl/TaskFactory.java
! repl/src/impl/UnresolvedExceptionImpl.java
! repl/testng/test/ReplaceTest.java