Update yarv compiler and decompiler to stop using Elsif node

Author: egiurleo

Diff for: lib/syntax_tree/yarv/compiler.rb

@@ -382,9 +382,9 @@ def visit_array(node)
         if (compiled = RubyVisitor.compile(node))
           iseq.duparray(compiled)
         elsif node.contents && node.contents.parts.length == 1 &&
-              node.contents.parts.first.is_a?(BareAssocHash) &&
-              node.contents.parts.first.assocs.length == 1 &&
-              node.contents.parts.first.assocs.first.is_a?(AssocSplat)
+                node.contents.parts.first.is_a?(BareAssocHash) &&
+                node.contents.parts.first.assocs.length == 1 &&
+                node.contents.parts.first.assocs.first.is_a?(AssocSplat)
           iseq.putspecialobject(PutSpecialObject::OBJECT_VMCORE)
           iseq.newhash(0)
           visit(node.contents.parts.first)
@@ -911,17 +911,6 @@ def visit_else(node)
         iseq.pop unless last_statement?
       end
 
-      def visit_elsif(node)
-        visit_if(
-          IfNode.new(
-            predicate: node.predicate,
-            statements: node.statements,
-            consequent: node.consequent,
-            location: node.location
-          )
-        )
-      end
-
       def visit_ensure(node)
       end
 
@@ -1067,7 +1056,8 @@ def visit_if_op(node)
                   ),
                 location: Location.default
               ),
-            location: Location.default
+            location: Location.default,
+            beginning: "if"
           )
         )
       end
@@ -1223,7 +1213,7 @@ def visit_opassign(node)
             iseq.swap
             iseq.pop
           elsif node.target.is_a?(VarField) &&
-                [Const, CVar, GVar].include?(node.target.value.class)
+                  [Const, CVar, GVar].include?(node.target.value.class)
             opassign_defined(node)
           else
             skip_value_label = iseq.label

Diff for: lib/syntax_tree/yarv/decompiler.rb

@@ -77,7 +77,7 @@ def decompile(iseq)
               Next(Args([]))
             ]
 
-            clause << IfNode(clause.pop, Statements(body), nil)
+            clause << IfNode(clause.pop, Statements(body), nil, "if")
           when Dup
             clause << clause.last
           when DupHash