Merge "Raise x86 arch requirement to prescott."

ARCH_X86_HAVE_POPCNT := false

# XXX: This flag is probably redundant, because it should be set by default

# by our toolchain binaries. However, there have been reports that this may

# not always work as intended, so keep it unless we have the time to check

# everything properly.

# Some intrinsic functions used by libcxx only exist for prescott or newer CPUs.

arch_variant_cflags := \

    -march=i686 \

    -march=prescott \