[clang] [Clang] Separate implicit int conversion on negation sign to new diagnostic group (PR #139429)

[via cfe-commits]

================
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 %s -verify -Wimplicit-int-conversion 
+// RUN: %clang_cc1 %s -verify -Wimplicit-int-conversion 
-Wno-implicit-int-conversion-on-negation -DNO_DIAG
+
+#ifdef NO_DIAG
+unsigned char test_no_diag(unsigned char x) {
+    return -x; // expected-no-diagnostics
+}
+#else
+unsigned char test_diag(unsigned char x) {
+    return -x; // expected-warning {{implicit conversion loses integer 
precision: 'int' to 'unsigned char' on negation}}
+}
+#endif
----------------
cor3ntin wrote:

```suggestion
// RUN: %clang_cc1 %s -verify=nowarn -Wimplicit-int-conversion 
// RUN: %clang_cc1 %s -verify -Wimplicit-int-conversion 
-Wno-implicit-int-conversion-on-negation -DNO_DIAG

// nowarn-no-diagnostics
    
unsigned char test_no_diag(unsigned char x) {
    return -x;  // expected-warning {{implicit conversion loses integer 
precision: 'int' to 'unsigned char' on negation}}
}
```

https://github.com/llvm/llvm-project/pull/139429
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