runtime: add `initializeTypeFieldLookup` on COFF
runtime: add `initializeTypeFieldLookup` on COFF

The runtime needs this method to initialize the type fields when loading
the images.  This was added to the ELF side of the initialization path
but not the COFF side.  It repairs the swiftCore.dll build for Windows.

allevato/swift,alblue/swift,benlangmuir/swift,shajrawi/swift,nathawes/swift,glessard/swift,JGiola/swift,devincoughlin/swift,shajrawi/swift,sschiau/swift,parkera/swift,parkera/swift,gregomni/swift,airspeedswift/swift,sschiau/swift,gribozavr/swift,danielmartin/swift,CodaFi/swift,austinzheng/swift,gregomni/swift,practicalswift/swift,glessard/swift,practicalswift/swift,alblue/swift,danielmartin/swift,danielmartin/swift,devincoughlin/swift,ahoppen/swift,shahmishal/swift,shahmishal/swift,tkremenek/swift,stephentyrone/swift,brentdax/swift,lorentey/swift,huonw/swift,shahmishal/swift,CodaFi/swift,atrick/swift,allevato/swift,tjw/swift,sschiau/swift,parkera/swift,harlanhaskins/swift,benlangmuir/swift,natecook1000/swift,devincoughlin/swift,sschiau/swift,gregomni/swift,jmgc/swift,airspeedswift/swift,jopamer/swift,karwa/swift,xwu/swift,roambotics/swift,alblue/swift,hooman/swift,xedin/swift,CodaFi/swift,natecook1000/swift,xwu/swift,allevato/swift,lorentey/swift,xedin/swift,jopamer/swift,gribozavr/swift,ahoppen/swift,huonw/swift,hooman/swift,jmgc/swift,amraboelela/swift,JGiola/swift,harlanhaskins/swift,amraboelela/swift,jckarter/swift,tkremenek/swift,practicalswift/swift,sschiau/swift,hooman/swift,alblue/swift,tjw/swift,shajrawi/swift,tkremenek/swift,benlangmuir/swift,glessard/swift,JGiola/swift,jopamer/swift,CodaFi/swift,stephentyrone/swift,aschwaighofer/swift,brentdax/swift,jopamer/swift,rudkx/swift,alblue/swift,jopamer/swift,rudkx/swift,karwa/swift,jckarter/swift,jckarter/swift,roambotics/swift,sschiau/swift,xedin/swift,practicalswift/swift,allevato/swift,natecook1000/swift,apple/swift,danielmartin/swift,allevato/swift,jmgc/swift,brentdax/swift,roambotics/swift,harlanhaskins/swift,devincoughlin/swift,allevato/swift,shajrawi/swift,nathawes/swift,karwa/swift,jmgc/swift,benlangmuir/swift,shajrawi/swift,xedin/swift,devincoughlin/swift,xwu/swift,alblue/swift,airspeedswift/swift,jmgc/swift,austinzheng/swift,tjw/swift,parkera/swift,harlanhaskins/swift,tkremenek/swift,xedin/swift,lorentey/swift,ahoppen/swift,airspeedswift/swift,jopamer/swift,apple/swift,sschiau/swift,devincoughlin/swift,brentdax/swift,parkera/swift,tjw/swift,karwa/swift,jmgc/swift,tkremenek/swift,airspeedswift/swift,xedin/swift,lorentey/swift,parkera/swift,JGiola/swift,xwu/swift,stephentyrone/swift,jckarter/swift,gregomni/swift,harlanhaskins/swift,rudkx/swift,tkremenek/swift,austinzheng/swift,natecook1000/swift,xedin/swift,atrick/swift,xedin/swift,aschwaighofer/swift,airspeedswift/swift,apple/swift,apple/swift,devincoughlin/swift,aschwaighofer/swift,aschwaighofer/swift,nathawes/swift,atrick/swift,roambotics/swift,glessard/swift,gribozavr/swift,lorentey/swift,austinzheng/swift,apple/swift,karwa/swift,amraboelela/swift,practicalswift/swift,harlanhaskins/swift,karwa/swift,jopamer/swift,aschwaighofer/swift,xwu/swift,nathawes/swift,danielmartin/swift,amraboelela/swift,allevato/swift,gregomni/swift,amraboelela/swift,brentdax/swift,parkera/swift,danielmartin/swift,stephentyrone/swift,natecook1000/swift,shahmishal/swift,xwu/swift,hooman/swift,hooman/swift,jckarter/swift,gregomni/swift,amraboelela/swift,austinzheng/swift,practicalswift/swift,jmgc/swift,natecook1000/swift,austinzheng/swift,shajrawi/swift,roambotics/swift,danielmartin/swift,gribozavr/swift,hooman/swift,huonw/swift,ahoppen/swift,apple/swift,rudkx/swift,tjw/swift,tkremenek/swift,practicalswift/swift,alblue/swift,amraboelela/swift,CodaFi/swift,huonw/swift,sschiau/swift,CodaFi/swift,gribozavr/swift,stephentyrone/swift,nathawes/swift,nathawes/swift,lorentey/swift,atrick/swift,ahoppen/swift,shahmishal/swift,gribozavr/swift,devincoughlin/swift,atrick/swift,rudkx/swift,gribozavr/swift,huonw/swift,JGiola/swift,karwa/swift,jckarter/swift,stephentyrone/swift,jckarter/swift,tjw/swift,natecook1000/swift,JGiola/swift,shajrawi/swift,parkera/swift,aschwaighofer/swift,roambotics/swift,gribozavr/swift,shahmishal/swift,karwa/swift,stephentyrone/swift,lorentey/swift,xwu/swift,glessard/swift,brentdax/swift,shajrawi/swift,glessard/swift,shahmishal/swift,airspeedswift/swift,ahoppen/swift,harlanhaskins/swift,CodaFi/swift,huonw/swift,benlangmuir/swift,rudkx/swift,huonw/swift,lorentey/swift,brentdax/swift,nathawes/swift,aschwaighofer/swift,practicalswift/swift,atrick/swift,benlangmuir/swift,austinzheng/swift,shahmishal/swift,hooman/swift,tjw/swift