internal/rosa/llvm: migrate compiler-rt

The newLLVM family of functions predate the package system. This change migrates compiler-rt without changing any resulting artifacts.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/rosa.go

@@ -329,13 +329,13 @@ mkdir -vp /work/system/bin
 		}
 
 		boot := t - 1
-		musl, compilerRT, runtimes, clang := boot.NewLLVM()
+		musl, runtimes, clang := boot.NewLLVM()
 		toybox := Toybox
 		if flag&TEarly != 0 {
 			toybox = toyboxEarly
 		}
 		std := []pkg.Artifact{cureEtc{newIANAEtc()}, musl}
-		toolchain := []pkg.Artifact{compilerRT, runtimes, clang}
+		toolchain := []pkg.Artifact{boot.Load(LLVMCompilerRT), runtimes, clang}
 		utils := []pkg.Artifact{
 			boot.Load(Mksh),
 			boot.Load(toybox),