hg: amber/amber: simplify error messages removing interfaces Constables and ConstantDesc as too low level

[vicente.romero at oracle.com]

Changeset: 099b58c0ecc0
Author:    vromero
Date:      2018-09-11 10:05 -0700
URL:       http://hg.openjdk.java.net/amber/amber/rev/099b58c0ecc0

simplify error messages removing interfaces Constables and ConstantDesc as too low level

! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symtab.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/RichDiagnosticFormatter.java
! test/langtools/jdk/jshell/TypeNameTest.java
! test/langtools/tools/javac/T8187978/FilterOutCandidatesForDiagnosticsTest.out
! test/langtools/tools/javac/generics/inference/EagerReturnTypeResolution/EagerReturnTypeResolutionTestb.out
! test/langtools/tools/javac/varargs/6806876/T6806876.out