RFR: 8287647: VM debug support: find node by pattern in name or dump [v4]

[Emanuel Peter]

> **Goal**
> Refactor `Node::find`, allow not just searching for `node->_idx`, but also matching for `node->Name()` and even `node->dump()`.
> 
> **Proposal**
> Refactor `Node::find` into `visit_nodes`, which visits all nodes and calls a `callback` on them. This callback can be used to filter by `idx` (`find_node_by_idx`, `Node::find`, `find_node` etc.). It can also be used to match node names (`find_node_by_name`) and even node dump (`find_node_by_dump`).
> 
> Thus, I present these additional functions:
> `Node* find_node_by_name(const char* name)`: find all nodes matching the `name` pattern.
> `Node* find_node_by_dump(const char* pattern)`: find all nodes matching the `pattern`.
> The nodes are sorted by node idx, and then dumped.
> 
> Patterns can contain `*` characters to match any characters (eg. `Con*L` matches both `ConL` and `ConvI2L`)
> 
> **Usecase**
> Find all `CastII` nodes. Find all `Loop` nodes. Use `find_node_by_name`.
> 
> Find all all `CastII` nodes that depend on a rangecheck. Use `find_node_by_dump("CastII*range check dependency")`.
> Find all `Bool` nodes that perform a `[ne]` check. Use `find_node_by_dump("Bool*[ne]")`.
> Find all `Phi` nodes that are `tripcount`. Use `find_node_by_dump("Phi*tripcount")`.
> 
> Find all `Load` nodes that are associated with line 301 in some file. Use `find_node_by_dump("Load*line 301")`.
> 
> You can probably find more usecases yourself ;)

Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:

  adding resource marks, moving Unique_Mixed_Node_List to node.hpp

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/8988/files
  - new: https://git.openjdk.org/jdk/pull/8988/files/425515f3..52dd9917

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8988&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8988&range=02-03

  Stats: 64 lines in 2 files changed: 33 ins; 30 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/8988.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/8988/head:pull/8988

PR: https://git.openjdk.org/jdk/pull/8988