Wrap exceptions thrown by class builders and add details about class file being generated.

compiler/backend/src/org/jetbrains/kotlin/codegen/ClassFileFactory.java

@@ -286,14 +286,24 @@ public class ClassFileFactory implements OutputFileCollection {
         @NotNull
         @Override
         public byte[] asByteArray() {
+            try {
                 return generators.get(relativeClassFilePath).asBytes(builderFactory);
             }
+            catch (RuntimeException e) {
+                throw new RuntimeException("Error generating class file " + this.toString() + ": " + e.getMessage(), e);
+            }
+        }
 
         @NotNull
         @Override
         public String asText() {
+            try {
                 return generators.get(relativeClassFilePath).asText(builderFactory);
             }
+            catch (RuntimeException e) {
+                throw new RuntimeException("Error generating class file " + this.toString() + ": " + e.getMessage(), e);
+            }
+        }
 
         @NotNull
         @Override