Restructure atomic_*_z().
Restructure atomic_*_z().

Restructure atomic_*_z() so that no casting within macros is necessary.
This avoids warnings when compiling with clang.

splbio/jemalloc,geekboxzone/mmallow_external_jemalloc,geekboxzone/mmallow_external_jemalloc,android-ia/platform_external_jemalloc,tempbottle/jemalloc,Dmitry-Me/jemalloc,garoose/jemalloc,dxq-git/jemalloc,VRToxin/android_external_jemalloc,sudosurootdev/external_jemalloc,CMRemix/android_external_jemalloc,awreece/jemalloc,shekkbuilder/jemalloc,yy-nm/jemalloc,kmiku7/jemalloc,wfxiang08/jemalloc,xin3liang/platform_external_jemalloc,Dmitry-Me/jemalloc,wespelee/jemalloc,wqfish/jemalloc,wqfish/jemalloc,flyfeifan/jemalloc,tempbottle/jemalloc,8l/jemalloc,kmiku7/jemalloc,cpeterso/jemalloc,wqfish/jemalloc,geekboxzone/lollipop_external_jemalloc,garoose/jemalloc,awreece/jemalloc,wespelee/jemalloc,leebaok/jemalloc-4.2.1-readcode,xin3liang/platform_external_jemalloc,splbio/jemalloc,ahmetmircik/jemalloc,cpeterso/jemalloc,wespelee/jemalloc,flyfeifan/jemalloc,percona/jemalloc-debian,lilothar/jemalloc,CyanogenMod/android_external_jemalloc,android-ia/platform_external_jemalloc,lvfeng1130/jemalloc,AndroidExternal/jemalloc,TeamExodus/external_jemalloc,VRToxin/android_external_jemalloc,lilothar/jemalloc,AndroidExternal/jemalloc,glandium/jemalloc,CMRemix/android_external_jemalloc,dxq-git/jemalloc,wfxiang08/jemalloc,vashstorm/jemalloc,Snaipe/jemalloc,VRToxin/android_external_jemalloc,lilothar/jemalloc,sudosurootdev/external_jemalloc,leebaok/jemalloc-4.2.1-readcode,Snaipe/jemalloc,wespelee/jemalloc,8l/jemalloc,vashstorm/jemalloc,lvfeng1130/jemalloc,lilothar/jemalloc,ahmetmircik/jemalloc,ahmetmircik/jemalloc,TeamExodus/external_jemalloc,VRToxin/android_external_jemalloc,Snaipe/jemalloc,sudosurootdev/external_jemalloc,leebaok/jemalloc-4.2.1-readcode,percona/jemalloc-debian,jemalloc/jemalloc-cmake,Dmitry-Me/jemalloc,geekboxzone/mmallow_external_jemalloc,wqfish/jemalloc,shekkbuilder/jemalloc,glandium/jemalloc,wfxiang08/jemalloc,vashstorm/jemalloc,flyfeifan/jemalloc,8l/jemalloc,yy-nm/jemalloc,garoose/jemalloc,CMRemix/android_external_jemalloc,AndroidExternal/jemalloc,leebaok/jemalloc-4.2.1-readcode,android-ia/platform_external_jemalloc,wqfish/jemalloc,android-ia/platform_external_jemalloc,xin3liang/platform_external_jemalloc,vashstorm/jemalloc,tempbottle/jemalloc,splbio/jemalloc,geekboxzone/lollipop_external_jemalloc,TeamExodus/external_jemalloc,geekboxzone/mmallow_external_jemalloc,shekkbuilder/jemalloc,jemalloc/jemalloc-cmake,cpeterso/jemalloc,glandium/jemalloc,garoose/jemalloc,jemalloc/jemalloc-cmake,shekkbuilder/jemalloc,yy-nm/jemalloc,percona/jemalloc-debian,ahmetmircik/jemalloc,geekboxzone/lollipop_external_jemalloc,awreece/jemalloc,percona/jemalloc-debian,jemalloc/jemalloc-cmake,CyanogenMod/android_external_jemalloc,lvfeng1130/jemalloc,dxq-git/jemalloc,TeamExodus/external_jemalloc,kmiku7/jemalloc,glandium/jemalloc,kmiku7/jemalloc,CMRemix/android_external_jemalloc,awreece/jemalloc,8l/jemalloc,AndroidExternal/jemalloc,CyanogenMod/android_external_jemalloc,dxq-git/jemalloc,cpeterso/jemalloc,sudosurootdev/external_jemalloc,CyanogenMod/android_external_jemalloc,xin3liang/platform_external_jemalloc,tempbottle/jemalloc,yy-nm/jemalloc,flyfeifan/jemalloc,wfxiang08/jemalloc,Dmitry-Me/jemalloc,Snaipe/jemalloc,lvfeng1130/jemalloc,geekboxzone/lollipop_external_jemalloc