[llvm] [Offload] Lazily initialize platforms in the Offloading API (PR #227084)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- offload/liboffload/src/OffloadImpl.cpp offload/tools/offload-tblgen/EntryPointGen.cpp offload/unittests/OffloadAPI/init/olInit.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/offload/unittests/OffloadAPI/init/olInit.cpp b/offload/unittests/OffloadAPI/init/olInit.cpp
index da9642f06..2d4e1cb69 100644
--- a/offload/unittests/OffloadAPI/init/olInit.cpp
+++ b/offload/unittests/OffloadAPI/init/olInit.cpp
@@ -38,7 +38,7 @@ TEST_F(olInitTest, RepeatedInitWithDevices) {
   for (size_t I = 0; I < 3; I++) {
     ASSERT_SUCCESS(olInit(nullptr));
     size_t Count = 0;
-    
+
     // Force the platform to be initialized.
     ASSERT_SUCCESS(olIterateDevices(
         [](ol_device_handle_t, void *Data) {

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https://github.com/llvm/llvm-project/pull/227084