Extract some intrinsics out of rustc_codegen_llvm

A significant amount of intrinsics do not actually need backend-specific
behaviors to be implemented, instead relying on methods already in
rustc_codegen_ssa. So, extract those methods out to rustc_codegen_ssa,
so that each backend doesn't need to reimplement the same code.

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -687,7 +687,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                 })
                 .collect();
 
-            bx.codegen_intrinsic_call(
+            Self::codegen_intrinsic_call(
+                &mut bx,
                 *instance.as_ref().unwrap(),
                 &fn_abi,
                 &args,