Revert r276856 "Adjust Registry interface to not require plugins to export a registry"

This is causing a huge pile of buildbot failures.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@276857 91177308-0d34-0410-b5e6-96231b3b80d8

examples/AnnotateFunctions/CMakeLists.txt

-add_llvm_loadable_module(AnnotateFunctions AnnotateFunctions.cpp PLUGIN_TOOL clang)
+add_llvm_loadable_module(AnnotateFunctions AnnotateFunctions.cpp)
 
 if(LLVM_ENABLE_PLUGINS AND (WIN32 OR CYGWIN))
   target_link_libraries(AnnotateFunctions PRIVATE

examples/PrintFunctionNames/CMakeLists.txt

@@ -9,7 +9,7 @@ if( NOT MSVC ) # MSVC mangles symbols differently, and
   endif()
 endif()
 
-add_llvm_loadable_module(PrintFunctionNames PrintFunctionNames.cpp PLUGIN_TOOL clang)
+add_llvm_loadable_module(PrintFunctionNames PrintFunctionNames.cpp)
 
 if(LLVM_ENABLE_PLUGINS AND (WIN32 OR CYGWIN))
   target_link_libraries(PrintFunctionNames PRIVATE

include/clang/Frontend/FrontendPluginRegistry.h

@@ -13,6 +13,9 @@
 #include "clang/Frontend/FrontendAction.h"
 #include "llvm/Support/Registry.h"
 
+// Instantiated in FrontendAction.cpp.
+extern template class llvm::Registry<clang::PluginASTAction>;
+
 namespace clang {
 
 /// The frontend plugin registry.

include/clang/Lex/Preprocessor.h

@@ -1956,4 +1956,6 @@ typedef llvm::Registry<PragmaHandler> PragmaHandlerRegistry;
 
 }  // end namespace clang
 
+extern template class llvm::Registry<clang::PragmaHandler>;
+
 #endif

lib/Frontend/FrontendAction.cpp

@@ -33,7 +33,7 @@
 #include <system_error>
 using namespace clang;
 
-LLVM_INSTANTIATE_REGISTRY(FrontendPluginRegistry)
+template class llvm::Registry<clang::PluginASTAction>;
 
 namespace {
 

lib/Lex/Preprocessor.cpp

@@ -54,7 +54,7 @@
 #include <utility>
 using namespace clang;
 
-LLVM_INSTANTIATE_REGISTRY(PragmaHandlerRegistry)
+template class llvm::Registry<clang::PragmaHandler>;
 
 //===----------------------------------------------------------------------===//
 ExternalPreprocessorSource::~ExternalPreprocessorSource() { }

lib/Tooling/CompilationDatabase.cpp

@@ -32,8 +32,6 @@
 using namespace clang;
 using namespace tooling;
 
-LLVM_INSTANTIATE_REGISTRY(CompilationDatabasePluginRegistry)
-
 CompilationDatabase::~CompilationDatabase() {}
 
 std::unique_ptr<CompilationDatabase>