hg: jdk/sandbox: 8210435: don't add local variable spots if they are DCE'ed by the compiler

[chris.hegarty at oracle.com]

Changeset: 805807f15830
Author:    vromero
Date:      2018-09-06 05:44 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/805807f15830

8210435: don't add local variable spots if they are DCE'ed by the compiler
Reviewed-by: mcimadamore

! src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java
+ test/langtools/tools/javac/T8210435/NoLocalsMustBeReservedForDCEedVarsTest.java