Print merged arena stats iff multiple arenas.
Print merged arena stats iff multiple arenas.

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