[ORC] Ensure that llvm_orc_registerJITLoaderGDBAllocAction is linked into tools.

Add a reference to llvm_orc_registerJITLoaderGDBAllocAction from the
linkComponents function in the lli, llvm-jitlink, and llvm-jitlink-executor
tools. This ensures that llvm_orc_registerJITLoaderGDBAllocAction is not
dead-stripped in optimized builds, which may cause failures in these tools.

The llvm_orc_registerJITLoaderGDBAllocAction function was originally added with
MachO debugging support in 69be352, but that patch failed to update the
linkComponents functions.

http://llvm.org/PR56817
(cherry picked from commit b5f76d8)

Author: lhames

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

@@ -19,4 +19,7 @@
 extern "C" llvm::orc::shared::CWrapperFunctionResult
 llvm_orc_registerJITLoaderGDBWrapper(const char *Data, uint64_t Size);
 
+extern "C" llvm::orc::shared::CWrapperFunctionResult
+llvm_orc_registerJITLoaderGDBAllocAction(const char *Data, size_t Size);
+
 #endif // LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_JITLOADERGDB_H

llvm/tools/lli/lli.cpp

@@ -291,7 +291,8 @@ namespace {
 LLVM_ATTRIBUTE_USED void linkComponents() {
   errs() << (void *)&llvm_orc_registerEHFrameSectionWrapper
          << (void *)&llvm_orc_deregisterEHFrameSectionWrapper
-         << (void *)&llvm_orc_registerJITLoaderGDBWrapper;
+         << (void *)&llvm_orc_registerJITLoaderGDBWrapper
+         << (void *)&llvm_orc_registerJITLoaderGDBAllocAction;
 }
 
 //===----------------------------------------------------------------------===//

llvm/tools/llvm-jitlink/llvm-jitlink-executor/llvm-jitlink-executor.cpp

@@ -39,7 +39,8 @@ ExitOnError ExitOnErr;
 LLVM_ATTRIBUTE_USED void linkComponents() {
   errs() << (void *)&llvm_orc_registerEHFrameSectionWrapper
          << (void *)&llvm_orc_deregisterEHFrameSectionWrapper
-         << (void *)&llvm_orc_registerJITLoaderGDBWrapper;
+         << (void *)&llvm_orc_registerJITLoaderGDBWrapper
+         << (void *)&llvm_orc_registerJITLoaderGDBAllocAction;
 }
 
 void printErrorAndExit(Twine ErrMsg) {

llvm/tools/llvm-jitlink/llvm-jitlink.cpp

@@ -233,7 +233,8 @@ static ExitOnError ExitOnErr;
 static LLVM_ATTRIBUTE_USED void linkComponents() {
   errs() << (void *)&llvm_orc_registerEHFrameSectionWrapper
          << (void *)&llvm_orc_deregisterEHFrameSectionWrapper
-         << (void *)&llvm_orc_registerJITLoaderGDBWrapper;
+         << (void *)&llvm_orc_registerJITLoaderGDBWrapper
+         << (void *)&llvm_orc_registerJITLoaderGDBAllocAction;
 }
 
 static bool UseTestResultOverride = false;