[clang] [Clang] Defaults `-Wunicode-whitespace` to an error. (PR #210945)

[Corentin Jabot via cfe-commits]

================
@@ -166,7 +166,7 @@ void test_block() {
       ^MIG_SERVER_ROUTINE (mach_port_name_t port,
                            vm_address_t address, vm_size_t size) {
         vm_deallocate(port, address, size); // expected-note{{Value passed through parameter 'address' is deallocated}}
-        return KERN_ERROR; // expected-warning{{MIG callback fails with error after deallocating argument value. This is a use-after-free vulnerability because the caller will try to deallocate it again}}
+        return KERN_ERROR; // expected-warning{{MIG callback fails with error after deallocating argument value. This is a use-after-free vulnerability because the caller will try to deallocate it again}}
----------------
cor3ntin wrote:

You'd think so!
>  |   File /home/cor3ntin/dev/compilers/LLVM/llvm-project/clang/test/Analysis/mig.mm Line 169: treating character <U+' ' U+00A0> as whitespace


https://github.com/llvm/llvm-project/pull/210945