Enable LoongArch CI

Author: heiher

Diff for: .github/workflows/main.yml

@@ -100,9 +100,8 @@ jobs:
           os: ubuntu-latest
         - tuple: thumbv7em-none-eabihf
           os: ubuntu-latest
-        # Temporarily disabled due to fallout from SIMD ABI checking.
-        #- tuple: loongarch64-unknown-linux-gnu
-        #  os: ubuntu-latest
+        - tuple: loongarch64-unknown-linux-gnu
+          os: ubuntu-latest
         - tuple: wasm32-wasip1
           os: ubuntu-latest