Move the helper function for x86 'fxtract' to g_generic_x87.c so
it can be shared by the x86 and amd64 front ends, then use it to
implement fxtract on amd64.



git-svn-id: svn://svn.valgrind.org/vex/trunk@1593 8f6e269a-dfd6-0310-a8e1-e2731360e62c
6 files changed