[ORC] Add visibility macros to functions needed by lli and jitlink

Annotating these symbols will fix missing symbols errors for lli and llvm-jitlink when
when the LLVM is built as shared library on windows with explicit symbol visibility
macros enabled.

This is part of the work to enable LLVM_BUILD_LLVM_DYLIB and plugins on window.

llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.h

@@ -14,6 +14,7 @@
 #define LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_JITLOADERGDB_H
 
 #include "llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h"
+#include "llvm/Support/Compiler.h"
 #include <cstdint>
 
 // Keep in sync with gdb/gdb/jit.h
@@ -42,10 +43,10 @@ struct jit_descriptor {
 };
 }
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerJITLoaderGDBWrapper(const char *Data, uint64_t Size);
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerJITLoaderGDBAllocAction(const char *Data, size_t Size);
 
 #endif // LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_JITLOADERGDB_H

llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/JITLoaderPerf.h

@@ -14,15 +14,16 @@
 #define LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_JITLOADERPERF_H
 
 #include "llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h"
+#include "llvm/Support/Compiler.h"
 #include <cstdint>
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerJITLoaderPerfImpl(const char *Data, uint64_t Size);
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerJITLoaderPerfStart(const char *Data, uint64_t Size);
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerJITLoaderPerfEnd(const char *Data, uint64_t Size);
 
 #endif // LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_JITLOADERPERF_H

llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/JITLoaderVTune.h

@@ -15,15 +15,16 @@
 #define LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_JITLOADERVTUNE_H
 
 #include "llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h"
+#include "llvm/Support/Compiler.h"
 #include <cstdint>
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerVTuneImpl(const char *Data, uint64_t Size);
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_unregisterVTuneImpl(const char *Data, uint64_t Size);
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_test_registerVTuneImpl(const char *Data, uint64_t Size);
 
 #endif // LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_JITLOADERVTUNE_H

llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/RegisterEHFrames.h

@@ -17,6 +17,7 @@
 #define LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_REGISTEREHFRAMES_H
 
 #include "llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Error.h"
 
 namespace llvm {
@@ -33,10 +34,10 @@ Error deregisterEHFrameSection(const void *EHFrameSectionAddr,
 } // end namespace orc
 } // end namespace llvm
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerEHFrameSectionWrapper(const char *Data, uint64_t Size);
 
-extern "C" llvm::orc::shared::CWrapperFunctionResult
+extern "C" LLVM_ABI llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_deregisterEHFrameSectionWrapper(const char *Data, uint64_t Size);
 
 #endif // LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_REGISTEREHFRAMES_H