[clang] [clang][ExprConst] Move getLangOpts() to interp::State subclasses (PR #159280)

[Timm Baeder via cfe-commits]

================
@@ -945,6 +945,7 @@ namespace {
     }
 
     ASTContext &getASTContext() const override { return Ctx; }
+    const LangOptions &getLangOpts() const { return Ctx.getLangOpts(); }
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tbaederr wrote:

```console
$ grep "Info.getLangOpts()" ../clang/lib/AST/ExprConstant.cpp | wc -l
61
```
 Yep

https://github.com/llvm/llvm-project/pull/159280