hg: jdk9/sandbox/langtools: 8171294: Slow compilation with long classpaths under JDK 9

[chris.hegarty at oracle.com]

Changeset: f38d10d479c1
Author:    jlahoda
Date:      2017-02-01 15:03 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/langtools/rev/f38d10d479c1

8171294: Slow compilation with long classpaths under JDK 9
Summary: Precompute packages contained in jars, to quickly determine at the lookup time whether a jar contains the given package
Reviewed-by: jjg
Contributed-by: maurizio.cimadamore at oracle.com

! src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java