Generalized base.rs#call_memcpy and everything that it uses

Generalized operand.rs#nontemporal_store and fixed tidy issues

Generalized operand.rs#nontemporal_store's implem even more
With a BuilderMethod trait implemented by Builder for LLVM

Cleaned builder.rs : no more code duplication, no more ValueTrait

Full traitification of builder.rs

src/librustc_codegen_llvm/lib.rs

@@ -102,6 +102,8 @@ mod back {
     pub mod wasm;
 }
 
+mod traits;
+
 mod abi;
 mod allocator;
 mod asm;