hg: amber/amber/langtools: manual merge with constant-folding branch

[vicente.romero at oracle.com]

Changeset: c0cd01aa4e33
Author:    vromero
Date:      2017-08-23 14:06 -0400
URL:       http://hg.openjdk.java.net/amber/amber/langtools/rev/c0cd01aa4e33

manual merge with constant-folding branch

! src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/SpecialConstantUtils.java
! test/tools/javac/specialConstantFolding/CondyCodeGenerationTest.java
! test/tools/javac/specialConstantFolding/IndyCodeGenerationTest.java