8148834: Update module-info reader/writer to 53.0

[Alan Bateman]

javac has been switched to generate v53.0 class files. ASM, pack200 and 
several other areas have been updated too. We have two places in the 
module-info reader/writing that needs to be updated so I need a Reviewer 
to get this into jdk9/dev.

-Alan

diff --git 
a/src/java.base/share/classes/java/lang/module/ModuleInfo.java 
b/src/java.base/share/classes/java/lang/module/ModuleInfo.java
--- a/src/java.base/share/classes/java/lang/module/ModuleInfo.java
+++ b/src/java.base/share/classes/java/lang/module/ModuleInfo.java
@@ -154,7 +154,7 @@
          int minor_version = in.readUnsignedShort();
          int major_version = in.readUnsignedShort();
          if (major_version < 53) {
-            // throw invalidModuleDescriptor"Must be >= 53.0");
+            throw invalidModuleDescriptor("Must be >= 53.0");
          }

          ConstantPool cpool = new ConstantPool(in);
diff --git 
a/src/java.base/share/classes/jdk/internal/module/ModuleInfoWriter.java 
b/src/java.base/share/classes/jdk/internal/module/ModuleInfoWriter.java
--- a/src/java.base/share/classes/jdk/internal/module/ModuleInfoWriter.java
+++ b/src/java.base/share/classes/jdk/internal/module/ModuleInfoWriter.java
@@ -54,7 +54,7 @@
          ClassWriter cw = new ClassWriter(0);

          String name = md.name().replace('.', '/') + "/module-info";
-        cw.visit(Opcodes.V1_8, ACC_MODULE, name, null, null, null);
+        cw.visit(Opcodes.V1_9, ACC_MODULE, name, null, null, null);

          cw.visitAttribute(new ModuleAttribute(md));
          cw.visitAttribute(new ConcealedPackagesAttribute(md.conceals()));