use ASM6 instead of ASM5

src/core/lombok/bytecode/AsmUtil.java

@@ -37,7 +37,7 @@ class AsmUtil {
 		ClassReader reader = new ClassReader(byteCode);
 		ClassWriter writer = new FixedClassWriter(reader, 0);
 		
-		ClassVisitor visitor = new ClassVisitor(Opcodes.ASM5, writer) {
+		ClassVisitor visitor = new ClassVisitor(Opcodes.ASM6, writer) {
 			@Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
 				return new JSRInlinerAdapter(super.visitMethod(access, name, desc, signature, exceptions), access, name, desc, signature, exceptions);
 			}

src/core/lombok/bytecode/PreventNullAnalysisRemover.java

@@ -50,7 +50,7 @@ public class PreventNullAnalysisRemover implements PostCompilerTransformation {
 		
 		class PreventNullAnalysisVisitor extends MethodVisitor {
 			PreventNullAnalysisVisitor(MethodVisitor mv) {
-				super(Opcodes.ASM5, mv);
+				super(Opcodes.ASM6, mv);
 			}
 			
 			@Override public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) {
@@ -68,7 +68,7 @@ public class PreventNullAnalysisRemover implements PostCompilerTransformation {
 			}
 		}
 		
-		reader.accept(new ClassVisitor(Opcodes.ASM5, writer) {
+		reader.accept(new ClassVisitor(Opcodes.ASM6, writer) {
 			@Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
 				return new PreventNullAnalysisVisitor(super.visitMethod(access, name, desc, signature, exceptions));
 			}

src/core/lombok/bytecode/SneakyThrowsRemover.java

@@ -47,12 +47,12 @@ public class SneakyThrowsRemover implements PostCompilerTransformation {
 		
 		ClassReader reader = new ClassReader(fixedByteCode);
 		ClassWriter writer = new ClassWriter(reader, 0);
-		
+
 		final AtomicBoolean changesMade = new AtomicBoolean();
 		
 		class SneakyThrowsRemoverVisitor extends MethodVisitor {
 			SneakyThrowsRemoverVisitor(MethodVisitor mv) {
-				super(Opcodes.ASM5, mv);
+				super(Opcodes.ASM6, mv);
 			}
 			
 			private boolean methodInsnQueued = false;