[clang] [clang][NFC] Mark some ASTMatchers constructors constexpr. (PR #223903)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Eli Friedman (efriedma-quic)

<details>
<summary>Changes</summary>

Suppresses a bunch of -Wglobal-constructors warnings in ASTMatchersInternal.cpp .

---
Full diff: https://github.com/llvm/llvm-project/pull/223903.diff


1 Files Affected:

- (modified) clang/include/clang/ASTMatchers/ASTMatchersInternal.h (+3-3) 


``````````diff
diff --git a/clang/include/clang/ASTMatchers/ASTMatchersInternal.h b/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
index cb12d10d628b6..efb3c4c334b4c 100644
--- a/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
@@ -1307,7 +1307,7 @@ class VariadicDynCastAllOfMatcher
     : public VariadicFunction<BindableMatcher<SourceT>, Matcher<TargetT>,
                               makeDynCastAllOfComposite<SourceT, TargetT>> {
 public:
-  VariadicDynCastAllOfMatcher() {}
+  constexpr VariadicDynCastAllOfMatcher() {}
 };
 
 /// A \c VariadicAllOfMatcher<T> object is a variadic functor that takes
@@ -1325,7 +1325,7 @@ class VariadicAllOfMatcher
     : public VariadicFunction<BindableMatcher<T>, Matcher<T>,
                               makeAllOfComposite<T>> {
 public:
-  VariadicAllOfMatcher() {}
+  constexpr VariadicAllOfMatcher() {}
 };
 
 /// VariadicOperatorMatcher related types.
@@ -1886,7 +1886,7 @@ class TypeTraversePolymorphicMatcher {
 
   struct Func
       : public VariadicFunction<Self, Matcher<InnerTBase>, &Self::create> {
-    Func() {}
+    constexpr Func() {}
   };
 
 private:

``````````

</details>


https://github.com/llvm/llvm-project/pull/223903