[clang] [clang-tools-extra] [libcxx] [clang][Modules] Remove unnecessary includes of `Module.h` (PR #93417)

[David Stone via cfe-commits]

================
@@ -42,7 +41,11 @@
 #include <memory>
 #include <vector>
 
-namespace clang::clangd {
+namespace clang {
+
+class Module;
----------------
davidstone wrote:

Specifically I'm following the guidance at: https://llvm.org/docs/CodingStandards.html#include-as-little-as-possible

https://github.com/llvm/llvm-project/pull/93417