[cast-opt] Eliminate always true if statement.
[cast-opt] Eliminate always true if statement.

I think that this is a result of previous refactorings. This code has a long
time assert in it that Src (since 2016) is an address and for a long time the bridged type has
always been an object (since 2015). So, thus we know that the following is always true.

  SILBridgedTy != Src->getType()

I also removed a level of indentation. NFC.

The 2015 commit hash is: 2dd38eee0ede4a51f4e7d1bf9272ae91b3a8a1ff (the original commit).
The 2016 commit hash is: 506ab9809f0187c5242d57cadd80e9c07286329e

shajrawi/swift,parkera/swift,jckarter/swift,nathawes/swift,ahoppen/swift,airspeedswift/swift,hooman/swift,devincoughlin/swift,harlanhaskins/swift,JGiola/swift,shajrawi/swift,harlanhaskins/swift,aschwaighofer/swift,xedin/swift,glessard/swift,benlangmuir/swift,aschwaighofer/swift,roambotics/swift,gribozavr/swift,hooman/swift,allevato/swift,karwa/swift,gribozavr/swift,karwa/swift,xedin/swift,devincoughlin/swift,devincoughlin/swift,parkera/swift,tkremenek/swift,gregomni/swift,CodaFi/swift,lorentey/swift,shajrawi/swift,gregomni/swift,lorentey/swift,airspeedswift/swift,karwa/swift,nathawes/swift,JGiola/swift,apple/swift,ahoppen/swift,roambotics/swift,jckarter/swift,shahmishal/swift,jmgc/swift,apple/swift,parkera/swift,aschwaighofer/swift,harlanhaskins/swift,jmgc/swift,parkera/swift,JGiola/swift,rudkx/swift,roambotics/swift,roambotics/swift,harlanhaskins/swift,nathawes/swift,rudkx/swift,rudkx/swift,allevato/swift,lorentey/swift,xwu/swift,tkremenek/swift,sschiau/swift,airspeedswift/swift,karwa/swift,CodaFi/swift,gregomni/swift,karwa/swift,gribozavr/swift,benlangmuir/swift,sschiau/swift,gribozavr/swift,gribozavr/swift,shahmishal/swift,gregomni/swift,devincoughlin/swift,tkremenek/swift,jmgc/swift,allevato/swift,xwu/swift,sschiau/swift,harlanhaskins/swift,lorentey/swift,karwa/swift,gribozavr/swift,jmgc/swift,jmgc/swift,shajrawi/swift,tkremenek/swift,aschwaighofer/swift,jckarter/swift,shahmishal/swift,ahoppen/swift,shajrawi/swift,JGiola/swift,xwu/swift,stephentyrone/swift,hooman/swift,lorentey/swift,stephentyrone/swift,tkremenek/swift,jckarter/swift,nathawes/swift,atrick/swift,xwu/swift,atrick/swift,karwa/swift,hooman/swift,lorentey/swift,parkera/swift,hooman/swift,apple/swift,karwa/swift,shajrawi/swift,glessard/swift,jckarter/swift,xwu/swift,gregomni/swift,xedin/swift,aschwaighofer/swift,jmgc/swift,airspeedswift/swift,tkremenek/swift,CodaFi/swift,ahoppen/swift,JGiola/swift,xedin/swift,atrick/swift,xedin/swift,benlangmuir/swift,jckarter/swift,sschiau/swift,rudkx/swift,xedin/swift,gribozavr/swift,glessard/swift,atrick/swift,harlanhaskins/swift,apple/swift,parkera/swift,sschiau/swift,devincoughlin/swift,nathawes/swift,shajrawi/swift,roambotics/swift,allevato/swift,xwu/swift,jmgc/swift,rudkx/swift,lorentey/swift,atrick/swift,airspeedswift/swift,stephentyrone/swift,shajrawi/swift,glessard/swift,tkremenek/swift,aschwaighofer/swift,allevato/swift,roambotics/swift,devincoughlin/swift,harlanhaskins/swift,hooman/swift,nathawes/swift,CodaFi/swift,stephentyrone/swift,lorentey/swift,xedin/swift,allevato/swift,shahmishal/swift,benlangmuir/swift,xedin/swift,gregomni/swift,sschiau/swift,apple/swift,jckarter/swift,aschwaighofer/swift,benlangmuir/swift,apple/swift,devincoughlin/swift,airspeedswift/swift,stephentyrone/swift,stephentyrone/swift,xwu/swift,gribozavr/swift,allevato/swift,atrick/swift,parkera/swift,hooman/swift,airspeedswift/swift,shahmishal/swift,ahoppen/swift,shahmishal/swift,sschiau/swift,shahmishal/swift,JGiola/swift,nathawes/swift,glessard/swift,shahmishal/swift,parkera/swift,ahoppen/swift,sschiau/swift,devincoughlin/swift,CodaFi/swift,glessard/swift,benlangmuir/swift,CodaFi/swift,rudkx/swift,stephentyrone/swift,CodaFi/swift