[Bug target/59952] -march=core-avx2 should not enable RTM

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59952

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Prerelease samples shouldn't count, people using those just can avoid using
-march=haswell and use -march=ivybridge -mavx2 or similar instead.  Can anyone
from Intel verify if all released Haswell CPUs have BMI2 (and if there aren't
plans to ship Haswell CPUs without BMI2)?