trans: Use LLVM's writeArchive to modify archives

mk/rustllvm.mk

@@ -24,7 +24,8 @@ LLVM_EXTRA_INCDIRS_$(1)= $$(call CFG_CC_INCLUDE_$(1),$(S)src/llvm/include) \
 endif
 
 RUSTLLVM_OBJS_CS_$(1) := $$(addprefix rustllvm/, \
-	ExecutionEngineWrapper.cpp RustWrapper.cpp PassWrapper.cpp)
+	ExecutionEngineWrapper.cpp RustWrapper.cpp PassWrapper.cpp \
+	ArchiveWrapper.cpp)
 
 RUSTLLVM_INCS_$(1) = $$(LLVM_EXTRA_INCDIRS_$(1)) \
                      $$(call CFG_CC_INCLUDE_$(1),$$(LLVM_INCDIR_$(1))) \

src/librustc/lib.rs

@@ -99,7 +99,6 @@ pub mod diagnostics;
 
 pub mod back {
     pub use rustc_back::abi;
-    pub use rustc_back::archive;
     pub use rustc_back::arm;
     pub use rustc_back::mips;
     pub use rustc_back::mipsel;

src/librustc/metadata/loader.rs

@@ -212,7 +212,6 @@
 //! no means all of the necessary details. Take a look at the rest of
 //! metadata::loader or metadata::creader for all the juicy details!
 
-use back::archive::METADATA_FILENAME;
 use back::svh::Svh;
 use session::Session;
 use session::search_paths::PathKind;
@@ -280,6 +279,8 @@ pub struct CratePaths {
     pub rlib: Option<PathBuf>
 }
 
+pub const METADATA_FILENAME: &'static str = "rust.metadata.bin";
+
 impl CratePaths {
     fn paths(&self) -> Vec<PathBuf> {
         match (&self.dylib, &self.rlib) {