hg: jdk9/hs-comp/hotspot: 8054492: Casting can result in redundant null checks in generated code

[vladimir.kozlov at oracle.com]

Changeset: cea556d9d85d
Author:    kvn
Date:      2014-10-31 16:51 -0700
URL:       http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/cea556d9d85d

8054492: Casting can result in redundant null checks in generated code
Summary: add C2 intrinsic for Class.cast() method and force inline it too.
Reviewed-by: jrose, roland, drchase, iignatyev

! src/share/vm/classfile/vmSymbols.hpp
! src/share/vm/oops/method.cpp
! src/share/vm/opto/library_call.cpp
! src/share/vm/prims/whitebox.cpp
! test/TEST.groups
+ test/compiler/intrinsics/classcast/NullCheckDroppingsTest.java
! test/testlibrary/whitebox/sun/hotspot/code/NMethod.java