hg: jdk/submit: 8232165: Reduce allocations in ValueStack copying constructor

[claes.redestad at oracle.com]

Changeset: cd9c4e6aa631
Author:    redestad
Date:      2019-10-14 20:58 +0200
URL:       https://hg.openjdk.java.net/jdk/submit/rev/cd9c4e6aa631

8232165: Reduce allocations in ValueStack copying constructor
Reviewed-by: neliasso, kvn

! src/hotspot/share/c1/c1_ValueStack.cpp
! src/hotspot/share/c1/c1_ValueStack.hpp
! src/hotspot/share/ci/ciMetadata.hpp