[clang] [llvm][tblgen] Add `SourcePath` for `emitSourceFileHeader` (PR #65744)

[Shao-Ce SUN via cfe-commits]

" + sys::path::filename(Record.getInputFilename()),"
In-Reply-To: <llvm/llvm-project/pull/65744/clang at github.com>


sunshaoce wrote:

Addressed. Thanks! Now it is
```
/*===- TableGen'erated file -------------------------------------*- C++ -*-===*\
|*                                                                            *|
|* ValueTypes Source Fragment                                                 *|
|*                                                                            *|
|* Automatically generated file, do not edit!                                 *|
|* From: ValueTypes.td                                                        *|
|*                                                                            *|
\*===----------------------------------------------------------------------===*/
```

https://github.com/llvm/llvm-project/pull/65744