[clang] [AST] Iterate redecls starting from the canonical one in getRawCommentsForAnyRedecl() (PR #108475)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

@zyn0217 I've debugged the `DefineInlineTest.AddInline` failure with your new 
suggested change, it concerns the following scenario:

header.h
```c++
template <typename T> void foo();
template <> void foo<int>();
```

source.cpp:
```c++
#include "header.h"
template <> void foo<int>() {}
```

It seems the `FuntionDecl` for the explicit specialization declaration in the 
header file gets assigned the template parameter lists of the definition in the 
main file, and its `getBeginLoc()` starts returning the main-file location.

https://github.com/llvm/llvm-project/pull/108475
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