[clang-tools-extra] [clangd] [modules] Avoid building duplicated modules at the same time (PR #114365)

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``````````bash
git-clang-format --diff ccdfd1a182fc718997f21583aea95d321f03c967 ed160e18b941bca16a87f0ea400aca2406967ae1 --extensions h,cpp -- clang-tools-extra/clangd/ModulesBuilder.cpp clang-tools-extra/clangd/ModulesBuilder.h clang-tools-extra/clangd/unittests/PrerequisiteModulesTest.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/unittests/PrerequisiteModulesTest.cpp b/clang-tools-extra/clangd/unittests/PrerequisiteModulesTest.cpp
index a6c57acba8..67a2d1d39e 100644
--- a/clang-tools-extra/clangd/unittests/PrerequisiteModulesTest.cpp
+++ b/clang-tools-extra/clangd/unittests/PrerequisiteModulesTest.cpp
@@ -540,12 +540,13 @@ export int B = 44 + M;
 
   std::unique_ptr<PrerequisiteModules> AInfo, BInfo;
 
-  // Trying to build A and B at the same time and check we will only build module M once.
+  // Trying to build A and B at the same time and check we will only build
+  // module M once.
   AsyncTaskRunner ThreadPool;
-  ThreadPool.runAsync("A Job", [&] () {
+  ThreadPool.runAsync("A Job", [&]() {
     AInfo = Builder.buildPrerequisiteModulesFor(getFullPath("A.cppm"), FS);
   });
-  ThreadPool.runAsync("B Job", [&] () {
+  ThreadPool.runAsync("B Job", [&]() {
     BInfo = Builder.buildPrerequisiteModulesFor(getFullPath("B.cppm"), FS);
   });
   ThreadPool.wait();

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https://github.com/llvm/llvm-project/pull/114365