Remove a few unused context arguments

Author: eregon

src/main/java/org/truffleruby/core/exception/ExceptionNodes.java

@@ -127,7 +127,7 @@ private void initializeNameErrorCopy(RubyNameError self, RubyNameError from) {
         private void initializeExceptionCopy(RubyException self, RubyException from) {
             Backtrace backtrace = from.backtrace;
             if (backtrace != null) {
-                self.backtrace = backtrace.copy(getContext(), self);
+                self.backtrace = backtrace.copy(self);
             } else {
                 self.backtrace = null;
             }

src/main/java/org/truffleruby/core/exception/ExceptionOperations.java

@@ -37,7 +37,7 @@ public static String getMessage(Throwable throwable) {
     }
 
     @TruffleBoundary
-    private static String messageFieldToString(RubyContext context, RubyException exception) {
+    private static String messageFieldToString(RubyException exception) {
         Object message = exception.message;
         RubyStringLibrary strings = RubyStringLibrary.getUncached();
         if (message == null || message == Nil.INSTANCE) {
@@ -62,7 +62,7 @@ public static String messageToString(RubyContext context, RubyException exceptio
         } catch (Throwable e) {
             // Fall back to the internal message field
         }
-        return messageFieldToString(context, exception);
+        return messageFieldToString(exception);
     }
 
     public static RubyException createRubyException(RubyContext context, RubyClass rubyClass, Object message,

src/main/java/org/truffleruby/language/backtrace/Backtrace.java

@@ -171,7 +171,7 @@ private static String getRootName(RootNode root) {
 
     /** Used to copy the backtrace when copying {@code exception}. */
     @TruffleBoundary
-    public Backtrace copy(RubyContext context, RubyException exception) {
+    public Backtrace copy(RubyException exception) {
         Backtrace copy = new Backtrace(location, omitted, javaThrowable);
         // A Backtrace is 1-1-1 with a RaiseException and a Ruby exception.
         // Copy the RaiseException