[OpenCL] Update Interpreter to support OpenCL CPU test (#7979)

We will revert this change once we resolve the dependency on NEAT.

Author: cdai2

llvm/lib/ExecutionEngine/Interpreter/CMakeLists.txt

@@ -16,3 +16,9 @@ add_llvm_component_library(LLVMInterpreter
 if( LLVM_ENABLE_FFI )
   target_link_libraries( LLVMInterpreter PRIVATE FFI::ffi )
 endif()
+
+configure_file(
+  Interpreter.h
+  ${LLVM_BINARY_DIR}/include/llvm/ExecutionEngine/Interpreter/Interpreter.h)
+
+install(FILES Interpreter.h DESTINATION include/llvm/ExecutionEngine/Interpreter)

llvm/lib/ExecutionEngine/Interpreter/Interpreter.h

@@ -72,6 +72,7 @@ struct ExecutionContext {
 // Interpreter - This class represents the entirety of the interpreter.
 //
 class Interpreter : public ExecutionEngine, public InstVisitor<Interpreter> {
+protected:
   GenericValue ExitValue;          // The return value of the called function
   IntrinsicLowering *IL;
 
@@ -199,7 +200,11 @@ class Interpreter : public ExecutionEngine, public InstVisitor<Interpreter> {
   void initializeExecutionEngine() { }
   void initializeExternalFunctions();
   GenericValue getConstantExprValue(ConstantExpr *CE, ExecutionContext &SF);
+
+protected:
   GenericValue getOperandValue(Value *V, ExecutionContext &SF);
+
+private:
   GenericValue executeTruncInst(Value *SrcVal, Type *DstTy,
                                 ExecutionContext &SF);
   GenericValue executeSExtInst(Value *SrcVal, Type *DstTy,