Template out node creation functions

Only arena-aware not parser-aware. static inline inside of the
header so we don't have to pay the lack of LTO cost just for these
functions. Leaving parsing-specific logic inside prism.c, effectively
wrapping every one of these functions.

Author: kddnewton

.gitignore

@@ -32,6 +32,7 @@ out.svg
 /gemfiles/typecheck/bin/
 /include/prism/ast.h
 /include/prism/diagnostic.h
+/include/prism/node_new.h
 /javascript/node_modules/
 /javascript/package-lock.json
 /javascript/src/deserialize.js

docs/configuration.md

@@ -5,6 +5,7 @@ A lot of code in prism's repository is templated from a single configuration fil
 * `ext/prism/api_node.c` - for defining how to build Ruby objects for the nodes out of C structs
 * `include/prism/ast.h` - for defining the C structs that represent the nodes
 * `include/prism/diagnostic.h` - for defining the diagnostics
+* `include/prism/node_new.h` - for defining the functions that create the nodes in C
 * `javascript/src/deserialize.js` - for defining how to deserialize the nodes in JavaScript
 * `javascript/src/nodes.js` - for defining the nodes in JavaScript
 * `java/org/ruby_lang/prism/AbstractNodeVisitor.java` - for defining the visitor interface for the nodes in Java

prism.gemspec

@@ -52,6 +52,7 @@ Gem::Specification.new do |spec|
     "include/prism/diagnostic.h",
     "include/prism/encoding.h",
     "include/prism/node.h",
+    "include/prism/node_new.h",
     "include/prism/options.h",
     "include/prism/parser.h",
     "include/prism/prettyprint.h",