[clang] [Sema] Add code completion for if constexpr and consteval (PR #124315)

[via cfe-commits]

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@@ -0,0 +1,6 @@
+void test() {
+  if c
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cor3ntin wrote:

can you add a test for `if !` ?

https://github.com/llvm/llvm-project/pull/124315