pythonize uname for cpu target triple in windows

shark/iree_utils/cpu_utils.py

@@ -15,6 +15,7 @@
 # All the iree_cpu related functionalities go here.
 
 import subprocess
+import platform
 
 
 def get_cpu_count():
@@ -29,25 +30,16 @@ def get_cpu_count():
 
 # Get the default cpu args.
 def get_iree_cpu_args():
-    find_triple_cmd = "uname -s -m"
-    os_name, proc_name = (
-        subprocess.run(
-            find_triple_cmd, shell=True, stdout=subprocess.PIPE, check=True
-        )
-        .stdout.decode("utf-8")
-        .split()
-    )
+    uname = platform.uname()
+    os_name, proc_name = uname.system, uname.machine
+
     if os_name == "Darwin":
-        find_kernel_version_cmd = "uname -r"
-        kernel_version = subprocess.run(
-            find_kernel_version_cmd,
-            shell=True,
-            stdout=subprocess.PIPE,
-            check=True,
-        ).stdout.decode("utf-8")
+        kernel_version = uname.release
         target_triple = f"{proc_name}-apple-darwin{kernel_version}"
     elif os_name == "Linux":
         target_triple = f"{proc_name}-linux-gnu"
+    elif os_name == "Windows":
+        target_triple = "x86_64-pc-windows-msvc"
     else:
         error_message = f"OS Type f{os_name} not supported and triple can't be determined, open issue to dSHARK team please :)"
         raise Exception(error_message)