Store Fiber.current in a property
Store Fiber.current in a property

By getting rid of the Fiber.current getter and just resetting it every
time it changes we can drastically speed up access to that property,
since it saves a trip out of the v8 engine. In most cases it seems like
people will be using Fiber.current, so this is a good change to make.

laverdet/node-fibers,xolvio/node-fibers,pjump/node-fibers,tempbottle/node-fibers,cgvarela/node-fibers,tempbottle/node-fibers,lzpfmh/node-fibers,lzpfmh/node-fibers,rydn/node-fibers,laverdet/node-fibers,metamatt/node-fibers,pjump/node-fibers,pjump/node-fibers,Icenium/node-fibers,pjump/node-fibers,meteor/node-fibers,tempbottle/node-fibers,cgvarela/node-fibers,xolvio/node-fibers,cgvarela/node-fibers,tempbottle/node-fibers,Icenium/node-fibers,spookd/node-fibers,Icenium/node-fibers,d3m3vilurr/node-fibers,rydn/node-fibers,metamatt/node-fibers,dut3062796s/node-fibers,rydn/node-fibers,dut3062796s/node-fibers,dut3062796s/node-fibers,meteor/node-fibers,Sanjo/node-fibers,spookd/node-fibers,xolvio/node-fibers,d3m3vilurr/node-fibers,palsmadal/node-fibers,cgvarela/node-fibers,meteor/node-fibers,meteor/node-fibers,spookd/node-fibers,d3m3vilurr/node-fibers,Sanjo/node-fibers,spookd/node-fibers,Sanjo/node-fibers,laverdet/node-fibers,xolvio/node-fibers,rydn/node-fibers,d3m3vilurr/node-fibers,lzpfmh/node-fibers,laverdet/node-fibers,palsmadal/node-fibers,dut3062796s/node-fibers,metamatt/node-fibers,Icenium/node-fibers,palsmadal/node-fibers,palsmadal/node-fibers,Sanjo/node-fibers,lzpfmh/node-fibers,metamatt/node-fibers