IRGen: adjust the module hash section for COFF
IRGen: adjust the module hash section for COFF

COFF uses 8-character section names.  Adjust the section name for the
module hash from `.swift_modhash` to `.sw5hash` to fit this restriction.

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