Revert change in cmake file.

Author: weiweichen

llvm/unittests/CodeGen/CMakeLists.txt

@@ -47,14 +47,8 @@ add_llvm_unittest(CodeGenTests
   TargetOptionsTest.cpp
   TestAsmPrinter.cpp
   MLRegAllocDevelopmentFeatures.cpp
-  X86MCInstLowerTest.cpp
   )
 
-add_llvm_unittest(CodeGenTests1
-  X86MCInstLowerTest.cpp
-)
-
 add_subdirectory(GlobalISel)
 
 target_link_libraries(CodeGenTests PRIVATE LLVMTestingSupport)
-target_link_libraries(CodeGenTests1 PRIVATE LLVMTestingSupport)