Revert "Revert "Remove unnecessary warning suppression""

This reverts commit afedf3bdc910882e41caf844f7ede3add17e8a6c.

Build failure fixed.

Change-Id: I46e7e222c2b5bfa5b1846f3fe87444afb70f1b31
diff --git a/cc/config/clang.go b/cc/config/clang.go
index 0f22034..89e567d 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -185,9 +185,6 @@
 		"-Wno-c++98-compat-extra-semi",
 
 		// Disable this warning until we can fix all instances where it fails.
-		"-Wno-self-assign-overloaded",
-
-		// Disable this warning until we can fix all instances where it fails.
 		"-Wno-constant-logical-operand",
 
 		// Disable this warning because we don't care about behavior with older compilers.