NPTL/ARCv2: Implement full memory barrier for NPTL
NPTL/ARCv2: Implement full memory barrier for NPTL

Signed-off-by: Vineet Gupta <af669d95a4c0de051445d4cafdbb2c5c4a2838be@synopsys.com>

foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,brgl/uclibc-ng,brgl/uclibc-ng,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,brgl/uclibc-ng,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,wbx-github/uclibc-ng,kraj/uclibc-ng