Commits on May 31, 2021

1. Support Ruby 2.7's pattern matching for Layout/SpaceAroundKeyword …

   This PR supports guard `if` and `unless` syntax keywords of Ruby 2.7's
   pattern matching for `Layout/SpaceAroundKeyword`.
   
   ```ruby
   case 42
   in 42 if true
     puts 'hello'
   end
   ```
   
   These nodes are called `if-guard` and `unless-guard` when using guard `if` and `unless`
   in pattern matching.
   
   ```ruby
   % ruby-parse example.rb
   (case-match
     (int 42)
     (in-pattern
       (int 42)
       (if-guard
         (true))
       (send nil :puts
         (str "hello"))) nil)
   ```
   
   See below for this guard semantics:
   whitequark/parser#574 (comment)

   

   koic committed May 31, 2021
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