[clang] [clang] Skip auto-init on scalar vars that have a non-constant Init and no self-ref (PR #94642)

[Alexander Potapenko via cfe-commits]

================
@@ -15,7 +15,7 @@ struct Foo {
 
 int foo(unsigned n) {
   bool var_size_1;
-  long var_size_8 = 123;
----------------
ramosian-glider wrote:

Can we have both the test cases in which scalar variables are auto-inited and 
where the initialization is skipped?
Something along the lines of:

```
long var_size_8_init = 123;
long var_size_8_noinit;
long var_size_8_init_later;
...
var_size_8_init_later = 456;
```

https://github.com/llvm/llvm-project/pull/94642
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