Remove some unused dependencies from rustc_trans_utils

Author: bjorn3

src/Cargo.lock

@@ -11,15 +11,5 @@ test = false
 
 [dependencies]
 rustc = { path = "../librustc" }
-rustc_allocator = { path = "../librustc_allocator" }
-rustc_back = { path = "../librustc_back" }
-rustc_bitflags = { path = "../librustc_bitflags" }
-rustc_const_math = { path = "../librustc_const_math" }
-rustc_data_structures = { path = "../librustc_data_structures" }
-rustc_errors = { path = "../librustc_errors" }
-rustc_incremental = { path = "../librustc_incremental" }
-rustc_llvm = { path = "../librustc_llvm" }
-rustc_platform_intrinsics = { path = "../librustc_platform_intrinsics" }
-serialize = { path = "../libserialize" }
 syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }