Request for review (S): 7032388: guarantee(VM_Version::supports_cmov()) failed: illegal instruction on i586 after 6919934

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/7032388/

7032388: guarantee(VM_Version::supports_cmov()) failed: illegal instruction on i586 after 6919934
Summary: 6919934 added some unguarded cmov instructions which hit a guarantee on older hardware.
Reviewed-by:

6919934 added some unguarded cmov instructions which hit a guarantee
on older hardware (pre-i686).

The fix is to either guard the added cmov instructions with a
supports_cmov() or let the cmov instruction decide itself if the
hardware supports cmov and if not use a branch-mov idiom.  I chose the
latter.

src/cpu/x86/vm/assembler_x86.cpp
src/cpu/x86/vm/assembler_x86.hpp
src/cpu/x86/vm/c1_LIRAssembler_x86.cpp
src/cpu/x86/vm/c1_Runtime1_x86.cpp
src/cpu/x86/vm/templateTable_x86_32.cpp