hg: panama/panama/jdk: - Don't parse a header if seen it before

[henry.jen at oracle.com]

Changeset: 0e4ff52eab74
Author:    henryjen
Date:      2016-05-13 18:38 -0700
URL:       http://hg.openjdk.java.net/panama/panama/jdk/rev/0e4ff52eab74

- Don't parse a header if seen it before
- TypeAlias always has canonical baseType

! src/jdk.jextract/share/classes/com/sun/tools/jextract/AsmCodeFactory.java
! src/jdk.jextract/share/classes/com/sun/tools/jextract/Context.java
! src/jdk.jextract/share/classes/com/sun/tools/jextract/HeaderFile.java
! src/jdk.jextract/share/classes/com/sun/tools/jextract/Main.java
! src/jdk.jextract/share/classes/com/sun/tools/jextract/TypeAlias.java
! src/jdk.jextract/share/classes/com/sun/tools/jextract/Utils.java