[Truffle] Unexclude passing test_regexp tests

Author: bjfish

test/mri/excludes_truffle/TestRegexp.rb

@@ -1,7 +1,6 @@
 exclude :"test_KCODE", "needs investigation"
 exclude :"test_assign_named_capture_to_reserved_word", "needs investigation"
 exclude :"test_char_class", "needs investigation"
-exclude :"test_char_type", "needs investigation"
 exclude :"test_dup", "needs investigation"
 exclude :"test_dup_warn", "needs investigation"
 exclude :"test_eq_tilde_can_be_overridden", "needs investigation"
@@ -12,7 +11,6 @@
 exclude :"test_inspect", "needs investigation"
 exclude :"test_invalid_escape_error", "needs investigation"
 exclude :"test_invalid_fragment", "needs investigation"
-exclude :"test_match", "needs investigation"
 exclude :"test_match_init_copy", "needs investigation"
 exclude :"test_match_offset_begin_end", "needs investigation"
 exclude :"test_matchdata", "needs investigation"
@@ -26,15 +24,12 @@
 exclude :"test_property_warn", "needs investigation"
 exclude :"test_regsub", "needs investigation"
 exclude :"test_regsub_K", "needs investigation"
-exclude :"test_ruby_dev_999", "needs investigation"
 exclude :"test_source", "needs investigation"
 exclude :"test_source_escaped", "needs investigation"
 exclude :"test_source_unescaped", "needs investigation"
 exclude :"test_taint", "needs investigation"
 exclude :"test_to_s", "needs investigation"
 exclude :"test_raw_hyphen_and_tk_char_type_after_range", "needs investigation"
 exclude :"test_unescape", "needs investigation"
-exclude :"test_unicode", "needs investigation"
 exclude :"test_uninitialized", "needs investigation"
 exclude :"test_union", "needs investigation"
-exclude :"test_word_boundary", "needs investigation"

truffle/src/main/java/org/jruby/truffle/nodes/rubinius/StringPrimitiveNodes.java

@@ -632,7 +632,7 @@ public Object stringIndex(VirtualFrame frame, RubyString string, RubyString patt
 
     }
 
-    @RubiniusPrimitive(name = "string_character_byte_index", needsSelf = false)
+    @RubiniusPrimitive(name = "string_character_byte_index", needsSelf = false, lowerFixnumParameters = {2, 3})
     @ImportStatic(StringGuards.class)
     public static abstract class CharacterByteIndexNode extends RubiniusPrimitiveNode {