Add alderlake arch variant

Test: m --no-skip-soong-tests
Bug: 368997831

Change-Id: Iec89c1358fea29f1b1d7a0433ad1d3b4375b8625
diff --git a/cc/config/x86_64_device.go b/cc/config/x86_64_device.go
index 5aa2a7e..e7ac038 100644
--- a/cc/config/x86_64_device.go
+++ b/cc/config/x86_64_device.go
@@ -40,6 +40,9 @@
 			"-march=x86-64",
 		},
 
+		"alderlake": []string{
+			"-march=alderlake",
+		},
 		"broadwell": []string{
 			"-march=broadwell",
 		},