Add loongarch64 support

Author: zhaixiaojuan

ci/build.sh

@@ -140,6 +140,7 @@ aarch64-fuchsia \
 armv5te-unknown-linux-gnueabi \
 armv5te-unknown-linux-musleabi \
 i686-pc-windows-gnu \
+loongarch64-unknown-linux-gnu \
 riscv64gc-unknown-linux-gnu \
 wasm32-wasi \
 x86_64-fortanix-unknown-sgx \

src/unix/linux_like/linux/align.rs

@@ -9,7 +9,8 @@ macro_rules! expand_align {
                            target_arch = "sparc64",
                            target_arch = "aarch64",
                            target_arch = "riscv64",
-                           target_arch = "riscv32"),
+                           target_arch = "riscv32",
+                           target_arch = "loongarch64"),
                        repr(align(4)))]
             #[cfg_attr(not(any(target_pointer_width = "32",
                                target_arch = "x86_64",
@@ -19,7 +20,8 @@ macro_rules! expand_align {
                                target_arch = "sparc64",
                                target_arch = "aarch64",
                                target_arch = "riscv64",
-                               target_arch = "riscv32")),
+                               target_arch = "riscv32",
+                               target_arch = "loongarch64")),
                        repr(align(8)))]
             pub struct pthread_mutexattr_t {
                 #[doc(hidden)]

src/unix/linux_like/linux/gnu/b64/loongarch64/align.rs

@@ -0,0 +1,7 @@
+s_no_extra_traits! {
+    #[allow(missing_debug_implementations)]
+    #[repr(align(16))]
+    pub struct max_align_t {
+        priv_: [f64; 4]
+    }
+}