[clang] [clang][CodeGen][AVR] Fix a crash in AVRABIInfo (PR #131976)

[Eli Friedman via cfe-commits]

================
@@ -114,3 +114,13 @@ struct s15 fooa(char a, char b) {
   x.arr[1] = b;
   return x;
 }
+
+struct s8_t {
+  char a;
+};
+
+// AVR-NOT:  {{.*}} signext
+// TINY-NOT: {{.*}} signext
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efriedma-quic wrote:

Can you rewrite this test to avoid "NOT"?  Something like `// AVR: define dso_local void @foob(i8 %{{.*}})`.  Or maybe just switch this file to use update_cc_test_checks.py.

https://github.com/llvm/llvm-project/pull/131976