should not check taint flag on rubyspec.

Now taint flag is obsolete and it is used fro shareaable flag.
So we should not check this flag.

include/ruby/internal/fl_type.h

@@ -52,6 +52,7 @@
 #define FL_PROMOTED1    RBIMPL_CAST((VALUE)RUBY_FL_PROMOTED1)
 #define FL_FINALIZE     RBIMPL_CAST((VALUE)RUBY_FL_FINALIZE)
 #define FL_TAINT        RBIMPL_CAST((VALUE)RUBY_FL_TAINT)
+#define FL_SHAREABLE    RBIMPL_CAST((VALUE)RUBY_FL_SHAREABLE)
 #define FL_UNTRUSTED    RBIMPL_CAST((VALUE)RUBY_FL_UNTRUSTED)
 #define FL_SEEN_OBJ_ID  RBIMPL_CAST((VALUE)RUBY_FL_SEEN_OBJ_ID)
 #define FL_EXIVAR       RBIMPL_CAST((VALUE)RUBY_FL_EXIVAR)

spec/ruby/optional/capi/ext/rbasic_spec.c

@@ -5,7 +5,11 @@
 extern "C" {
 #endif
 
+#ifndef FL_SHAREABLE
 static const VALUE VISIBLE_BITS = FL_TAINT | FL_FREEZE | ~(FL_USER0 - 1);
+#else
+static const VALUE VISIBLE_BITS = FL_FREEZE | ~(FL_USER0 - 1);
+#endif
 
 #if SIZEOF_VALUE == SIZEOF_LONG
 #define VALUE2NUM(v) ULONG2NUM(v)

spec/ruby/optional/capi/shared/rbasic.rb

@@ -66,9 +66,9 @@ describe :rbasic, shared: true do
     obj1, obj2 = @data.call
     initial = @specs.get_flags(obj1)
     @specs.get_flags(obj2).should == initial
-    @specs.set_flags(obj1, @taint | 1 << 14 | 1 << 16 | initial)
+    @specs.set_flags(obj1, 1 << 14 | 1 << 16 | initial)
     @specs.copy_flags(obj2, obj1)
-    @specs.get_flags(obj2).should == @taint | 1 << 14 | 1 << 16 | initial
+    @specs.get_flags(obj2).should == 1 << 14 | 1 << 16 | initial
     @specs.set_flags(obj1, initial)
     @specs.copy_flags(obj2, obj1)
     @specs.get_flags(obj2).should == initial