Use correct section name for embedded LLVM bitcode on OSX.

Author: michaelwoerister

src/librustc_trans/back/write.rs

@@ -863,7 +863,11 @@ unsafe fn embed_bitcode(cgcx: &CodegenContext,
         "rustc.embedded.module\0".as_ptr() as *const _,
     );
     llvm::LLVMSetInitializer(llglobal, llconst);
-    let section = if cgcx.opts.target_triple.triple().contains("-ios") {
+
+    let is_apple = cgcx.opts.target_triple.triple().contains("-ios") ||
+                   cgcx.opts.target_triple.triple().contains("-darwin");
+
+    let section = if is_apple {
         "__LLVM,__bitcode\0"
     } else {
         ".llvmbc\0"
@@ -879,7 +883,7 @@ unsafe fn embed_bitcode(cgcx: &CodegenContext,
         "rustc.embedded.cmdline\0".as_ptr() as *const _,
     );
     llvm::LLVMSetInitializer(llglobal, llconst);
-    let section = if cgcx.opts.target_triple.triple().contains("-ios") {
+    let section = if  is_apple {
         "__LLVM,__cmdline\0"
     } else {
         ".llvmcmd\0"