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

[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 ;)

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Commit messages:
 - style fixes, and implemented case insensitive strstr
 - make matching case insensitive
 - missing include
 - ensure null termination
 - guard against long pattern, and fix array/pointer issues
 - small logic fix
 - refactoring of Node::find
 - sort find results by idx
 - 8287647: VM debug support: find node by name or substring in dump text

Changes: https://git.openjdk.java.net/jdk/pull/8988/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8988&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287647
  Stats: 242 lines in 1 file changed: 194 ins; 47 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8988.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8988/head:pull/8988

PR: https://git.openjdk.java.net/jdk/pull/8988