hg: lambda/lambda/langtools: Unify two distinct approaches to type signature generation for lambdas.

[robert.field at oracle.com]

Changeset: 36afed07100f
Author:    rfield
Date:      2013-02-07 22:43 -0800
URL:       http://hg.openjdk.java.net/lambda/lambda/langtools/rev/36afed07100f

Unify two distinct approaches to type signature generation for lambdas.
Eliminate ClassWriter.assembleSig(Type type, ByteBuffer sigbuf) which had sigbug reference / mutual recursion problems.
Expose ClassWriter.typeSig(Type) and add .typeClassSig(Type).

! src/share/classes/com/sun/tools/javac/comp/LambdaToMethod.java
! src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java