Remove parrot bytecode as a separate language, as well as deprecated/redundant keys in languages.yml and put PIR+PASM in the Parrot group

lib/linguist/languages.yml

@@ -648,25 +648,19 @@ Parrot Internal Representation:
   search_term: pir
   aliases:
   - pir
-  primary_extension: .pir
+  group: Parrot
   extensions:
   - .pir
 
 Parrot Assembly:
   type: programming
   lexer: Text only
-  search_term: pasm
-  primary_extension: .pasm
+  group: Parrot
+  aliases:
+  - pasm
   extensions:
     - .pasm
 
-Parrot Bytecode:
-  type: data
-  search_term: pbc
-  primary_extension: .pbc
-  extensions:
-    - .pbc
-
 Perl:
   type: programming
   overrides:

test/test_blob.rb

@@ -82,7 +82,6 @@ class TestBlob < Test::Unit::TestCase
     assert blob("linguist.gem").binary?
     assert blob("octocat.ai").binary?
     assert blob("octocat.png").binary?
-    assert blob("hello.pbc").binary?
     assert !blob("README").binary?
     assert !blob("file.txt").binary?
     assert !blob("foo.rb").binary?
@@ -322,7 +321,6 @@ class TestBlob < Test::Unit::TestCase
     # https://github.com/parrot/parrot
     assert_equal Language['Parrot Internal Representation'], blob("hello.pir").language
     assert_equal Language['Parrot Assembly'], blob("hello.pasm").language
-    assert_equal Language['Parrot Bytecode'], blob("hello.pbc").language
   end
 
   def test_lexer