hg: hsx/hotspot-comp/hotspot: 8005522: use fast-string instructions on x86 for zeroing

[vladimir.kozlov at oracle.com]

Changeset: 00af3a3a8df4
Author:    kvn
Date:      2013-01-03 15:09 -0800
URL:       http://hg.openjdk.java.net/hsx/hotspot-comp/hotspot/rev/00af3a3a8df4

8005522: use fast-string instructions on x86 for zeroing
Summary: use 'rep stosb' instead of 'rep stosq' when fast-string operations are available.
Reviewed-by: twisti, roland

! src/cpu/x86/vm/assembler_x86.cpp
! src/cpu/x86/vm/assembler_x86.hpp
! src/cpu/x86/vm/globals_x86.hpp
! src/cpu/x86/vm/macroAssembler_x86.cpp
! src/cpu/x86/vm/macroAssembler_x86.hpp
! src/cpu/x86/vm/vm_version_x86.cpp
! src/cpu/x86/vm/vm_version_x86.hpp
! src/cpu/x86/vm/x86_32.ad
! src/cpu/x86/vm/x86_64.ad
! src/share/vm/opto/memnode.cpp