[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:  define {{.*}} i8 @foob(i8 {{.*}})
+// TINY  define {{.*}} i8 @foob(i8 {{.*}})
----------------
efriedma-quic wrote:

```suggestion
// AVR:  define {{.*}} i8 @foob(i8 %{{.*}})
// TINY: define {{.*}} i8 @foob(i8 %{{.*}})
```

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