Add tags for new failing specs

Author: eregon

spec/tags/core/kernel/eval_tags.txt

@@ -4,3 +4,5 @@ slow:Kernel#eval raises a LocalJumpError if there is no lambda-style closure in
 slow:Kernel#eval does not share locals across eval scopes
 fails(cannot store constant with name in binary encoding):Kernel#eval with a magic encoding comment ignores the magic encoding comment if it is after a frozen_string_literal magic comment
 fails:Kernel#eval with a magic encoding comment ignores the frozen_string_literal magic comment if it appears after a token and warns if $VERBOSE is true
+fails:Kernel#eval returns from the method calling #eval when evaluating 'return'
+fails:Kernel#eval returns from the method calling #eval when evaluating 'return' in BEGIN

spec/tags/core/string/tr_s_tags.txt

@@ -0,0 +1 @@
+fails:String#tr_s accepts c1-c1 notation to denote range of one character

spec/tags/core/string/tr_tags.txt

@@ -0,0 +1 @@
+fails:String#tr accepts c1-c1 notation to denote range of one character

spec/tags/language/pattern_matching_tags.txt

@@ -51,3 +51,4 @@ fails:Pattern matching Hash pattern calls #deconstruct_keys per pattern
 fails:Pattern matching Hash pattern can match partially
 fails:Pattern matching Hash pattern matches {} with {}
 fails:Pattern matching refinements are used for #deconstruct
+fails:Pattern matching can be standalone assoc operator that deconstructs value and properly scopes variables