hg: panama/dev: Machine code snippets: update implementation to latest changes from mainline.

[vladimir.x.ivanov at oracle.com]

Changeset: b672d4ef9ff4
Author:    vlivanov
Date:      2018-05-07 15:54 -0700
URL:       http://hg.openjdk.java.net/panama/dev/rev/b672d4ef9ff4

Machine code snippets: update implementation to latest changes from mainline.

! src/hotspot/cpu/x86/methodHandles_x86.cpp
! src/hotspot/share/ci/ciMachineCodeSnippet.cpp
! src/hotspot/share/ci/ciNativeEntryPoint.cpp
! src/hotspot/share/opto/machnode.cpp
! src/hotspot/share/opto/macro.cpp
! src/hotspot/share/prims/vector.cpp
! src/hotspot/share/runtime/codeSnippet.cpp