Revert "[ORC] Introduce EPCGenericRTDyldMemoryManager."

This reverts commit bef55a2 while I investigate
failures on some bots. Also reverts "[lli] Add ChildTarget dependence on
OrcTargetProcess library." (7a219d8) which was
a fallow-up to bef55a2.

Author: lhames

llvm/include/llvm/ExecutionEngine/Orc/EPCGenericRTDyldMemoryManager.h

@@ -37,9 +37,6 @@ extern const char *MemoryWriteUInt32sWrapperName;
 extern const char *MemoryWriteUInt64sWrapperName;
 extern const char *MemoryWriteBuffersWrapperName;
 
-extern const char *RegisterEHFrameSectionCustomDirectWrapperName;
-extern const char *DeregisterEHFrameSectionCustomDirectWrapperName;
-
 extern const char *RunAsMainWrapperName;
 
 using SPSSimpleExecutorDylibManagerOpenSignature =

llvm/include/llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h

@@ -33,22 +33,6 @@ Error deregisterEHFrameSection(const void *EHFrameSectionAddr,
 } // end namespace orc
 } // end namespace llvm
 
-/// An eh-frame registration utility suitable for use as a support function
-/// call. This function expects the direct address and size of the eh-frame
-/// section to register as its arguments (it does not treat its arguments as
-/// pointers to an SPS-serialized arg buffer).
-extern "C" llvm::orc::shared::detail::CWrapperFunctionResult
-llvm_orc_registerEHFrameSectionCustomDirectWrapper(
-    const char *EHFrameSectionAddr, uint64_t Size);
-
-/// An eh-frame deregistration utility suitable for use as a support function
-/// call. This function expects the direct address and size of the eh-frame
-/// section to register as its arguments (it does not treat its arguments as
-/// pointers to an SPS-serialized arg buffer).
-extern "C" llvm::orc::shared::detail::CWrapperFunctionResult
-llvm_orc_deregisterEHFrameSectionCustomDirectWrapper(
-    const char *EHFrameSectionAddr, uint64_t Size);
-
 extern "C" llvm::orc::shared::detail::CWrapperFunctionResult
 llvm_orc_registerEHFrameSectionWrapper(const char *Data, uint64_t Size);
 

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

@@ -9,7 +9,6 @@ add_llvm_component_library(LLVMOrcJIT
   EPCEHFrameRegistrar.cpp
   EPCGenericDylibManager.cpp
   EPCGenericJITLinkMemoryManager.cpp
-  EPCGenericRTDyldMemoryManager.cpp
   EPCIndirectionUtils.cpp
   ExecutionUtils.cpp
   IndirectionUtils.cpp