[clang] [analyzer] Add support for consteval in ConditionBRVisitor::VisitTerminator (PR #146859)

[Imad Aldij via cfe-commits]

================
@@ -0,0 +1,8 @@
+// RUN: %clang_analyze_cc1 -std=c++23 -analyzer-checker=core -verify %s
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imdj wrote:

Could we rely on feature detection? like
```
// RUN: %clang_analyze_cc1 -analyzer-checker=core -verify %s

#if __cpp_if_consteval >= 202106L
void test_consteval() {
...
#endif
```

https://github.com/llvm/llvm-project/pull/146859