Initial commit of AArch64 support for the llvm backend.

lib/llvm-backend/src/code.rs

@@ -8472,7 +8472,17 @@ impl<'ctx> ModuleCodeGenerator<LLVMFunctionCodeGenerator<'ctx>, LLVMBackend, Cod
                 info: true,
                 machine_code: true,
             }),
-            _ => unimplemented!("compile to target other than x86-64 is not supported"),
+            _ if triple.starts_with("aarch64") => {
+                Target::initialize_aarch64(&InitializationConfig {
+                    asm_parser: true,
+                    asm_printer: true,
+                    base: true,
+                    disassembler: true,
+                    info: true,
+                    machine_code: true,
+                })
+            }
+            _ => unimplemented!("target {} not supported", triple),
         }
 
         let target = Target::from_triple(&triple).unwrap();

lib/llvm-backend/src/lib.rs

@@ -6,7 +6,10 @@
     unused_unsafe,
     unreachable_patterns
 )]
-#![cfg_attr(not(target_os = "windows"), deny(dead_code))]
+#![cfg_attr(
+    all(not(target_os = "windows"), not(target_arch = "aarch64")),
+    deny(dead_code)
+)]
 #![cfg_attr(nightly, feature(unwind_attributes))]
 #![doc(html_favicon_url = "https://wasmer.io/static/icons/favicon.ico")]
 #![doc(html_logo_url = "https://avatars3.githubusercontent.com/u/44205449?s=200&v=4")]