Fix performance regression in arena_palloc().
Fix performance regression in arena_palloc().

Pass large allocation requests to arena_malloc() when possible.  This
regression was introduced by 155bfa7da18cab0d21d87aa2dce4554166836f5d
(Normalize size classes.).

yy-nm/jemalloc,wespelee/jemalloc,CMRemix/android_external_jemalloc,lilothar/jemalloc,tempbottle/jemalloc,glandium/jemalloc,shekkbuilder/jemalloc,jemalloc/jemalloc-cmake,8l/jemalloc,AndroidExternal/jemalloc,awreece/jemalloc,vashstorm/jemalloc,vashstorm/jemalloc,Snaipe/jemalloc,awreece/jemalloc,CMRemix/android_external_jemalloc,awreece/jemalloc,tempbottle/jemalloc,CMRemix/android_external_jemalloc,cpeterso/jemalloc,flyfeifan/jemalloc,dxq-git/jemalloc,Dmitry-Me/jemalloc,yy-nm/jemalloc,vashstorm/jemalloc,VRToxin/android_external_jemalloc,ahmetmircik/jemalloc,shekkbuilder/jemalloc,lvfeng1130/jemalloc,Dmitry-Me/jemalloc,garoose/jemalloc,yy-nm/jemalloc,wespelee/jemalloc,kmiku7/jemalloc,VRToxin/android_external_jemalloc,ahmetmircik/jemalloc,dxq-git/jemalloc,flyfeifan/jemalloc,jemalloc/jemalloc-cmake,vashstorm/jemalloc,jemalloc/jemalloc-cmake,8l/jemalloc,leebaok/jemalloc-4.2.1-readcode,kmiku7/jemalloc,flyfeifan/jemalloc,flyfeifan/jemalloc,tempbottle/jemalloc,Snaipe/jemalloc,ahmetmircik/jemalloc,wqfish/jemalloc,wespelee/jemalloc,cpeterso/jemalloc,lilothar/jemalloc,lilothar/jemalloc,shekkbuilder/jemalloc,glandium/jemalloc,lvfeng1130/jemalloc,garoose/jemalloc,wqfish/jemalloc,Snaipe/jemalloc,glandium/jemalloc,yy-nm/jemalloc,lvfeng1130/jemalloc,ahmetmircik/jemalloc,leebaok/jemalloc-4.2.1-readcode,VRToxin/android_external_jemalloc,Dmitry-Me/jemalloc,wqfish/jemalloc,AndroidExternal/jemalloc,VRToxin/android_external_jemalloc,leebaok/jemalloc-4.2.1-readcode,wespelee/jemalloc,AndroidExternal/jemalloc,garoose/jemalloc,jemalloc/jemalloc-cmake,lilothar/jemalloc,Dmitry-Me/jemalloc,Snaipe/jemalloc,glandium/jemalloc,8l/jemalloc,awreece/jemalloc,tempbottle/jemalloc,cpeterso/jemalloc,shekkbuilder/jemalloc,lvfeng1130/jemalloc,wfxiang08/jemalloc,kmiku7/jemalloc,dxq-git/jemalloc,kmiku7/jemalloc,8l/jemalloc,wfxiang08/jemalloc,wfxiang08/jemalloc,garoose/jemalloc,dxq-git/jemalloc,CMRemix/android_external_jemalloc,wqfish/jemalloc,wqfish/jemalloc,leebaok/jemalloc-4.2.1-readcode,cpeterso/jemalloc,AndroidExternal/jemalloc,wfxiang08/jemalloc