Use CC instead of .Compiler

Author: serenity4

src/stage1/compiler_utils.jl

@@ -1,5 +1,5 @@
 # Utilities that should probably go into CC
-using .Compiler: IRCode, CFG, BasicBlock, BBIdxIter
+using .CC: IRCode, CFG, BasicBlock, BBIdxIter
 
 function Base.push!(cfg::CFG, bb::BasicBlock)
     @assert cfg.blocks[end].stmts.stop+1 == bb.stmts.start