Add enum variants to the type namespace

Change to resolve and update compiler and libs for uses.

[breaking-change]

Enum variants are now in both the value and type namespaces. This means that
if you have a variant with the same name as a type in scope in a module, you
will get a name clash and thus an error. The solution is to either rename the
type or the variant.

src/librustc_llvm/lib.rs

@@ -324,11 +324,11 @@ pub enum AtomicOrdering {
 // Consts for the LLVMCodeGenFileType type (in include/llvm/c/TargetMachine.h)
 #[repr(C)]
 pub enum FileType {
-    AssemblyFile = 0,
-    ObjectFile = 1
+    AssemblyFileType = 0,
+    ObjectFileType = 1
 }
 
-pub enum Metadata {
+pub enum MetadataType {
     MD_dbg = 0,
     MD_tbaa = 1,
     MD_prof = 2,