Turn ByteArrayNodes.LocateNode into a primitive for efficiency.

Author: nirvdrum

src/main/java/org/truffleruby/core/support/ByteArrayNodes.java

@@ -15,7 +15,9 @@
 import com.oracle.truffle.api.strings.TruffleString;
 import org.truffleruby.annotations.CoreMethod;
 import org.truffleruby.annotations.CoreModule;
+import org.truffleruby.annotations.Primitive;
 import org.truffleruby.builtins.CoreMethodArrayArgumentsNode;
+import org.truffleruby.builtins.PrimitiveArrayArgumentsNode;
 import org.truffleruby.core.encoding.TStringUtils;
 import org.truffleruby.core.klass.RubyClass;
 import org.truffleruby.core.string.RubyString;
@@ -151,8 +153,8 @@ protected Object fillFromPointer(
 
     }
 
-    @CoreMethod(names = "locate", required = 3, lowerFixnum = { 2, 3 })
-    public abstract static class LocateNode extends CoreMethodArrayArgumentsNode {
+    @Primitive(name = "bytearray_locate", lowerFixnum = { 2, 3 })
+    public abstract static class LocateNode extends PrimitiveArrayArgumentsNode {
 
         @Specialization(
                 guards = "isSingleBytePattern(patternTString, patternEncoding)", limit = "1")

src/main/ruby/truffleruby/core/io.rb

@@ -202,7 +202,7 @@ def discard(skip)
     # Returns the number of bytes to fetch from the buffer up-to-
     # and-including +pattern+. Returns +nil+ if pattern is not found.
     def find(pattern, discard = nil)
-      if count = @storage.locate(pattern, @start, @used)
+      if count = Primitive.bytearray_locate(@storage, pattern, @start, @used)
         count - @start
       end
     end