Revert "CompilerRT: Normalize COMPILER_RT_DEFAULT_TARGET_TRIPLE" (#88663)

Reverts #88407

Author: wzssyqa

compiler-rt/cmake/Modules/CompilerRTUtils.cmake

@@ -362,22 +362,10 @@ macro(construct_compiler_rt_default_triple)
       message(FATAL_ERROR "CMAKE_C_COMPILER_TARGET must also be set when COMPILER_RT_DEFAULT_TARGET_ONLY is ON")
     endif()
     message(STATUS "cmake c compiler target: ${CMAKE_C_COMPILER_TARGET}")
-    if ("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
-      execute_process(COMMAND ${CMAKE_C_COMPILER} --target=${CMAKE_C_COMPILER_TARGET} -print-effective-triple
-                      OUTPUT_VARIABLE COMPILER_RT_DEFAULT_TARGET_TRIPLE
-                      OUTPUT_STRIP_TRAILING_WHITESPACE)
-    else()
-      set(COMPILER_RT_DEFAULT_TARGET_TRIPLE ${CMAKE_C_COMPILER_TARGET})
-    endif()
+    set(COMPILER_RT_DEFAULT_TARGET_TRIPLE ${CMAKE_C_COMPILER_TARGET})
   else()
-    if ("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
-      execute_process(COMMAND ${CMAKE_C_COMPILER} --target=${LLVM_TARGET_TRIPLE} -print-effective-triple
-                      OUTPUT_VARIABLE COMPILER_RT_DEFAULT_TARGET_TRIPLE
-                      OUTPUT_STRIP_TRAILING_WHITESPACE)
-    else()
-      set(COMPILER_RT_DEFAULT_TARGET_TRIPLE ${LLVM_TARGET_TRIPLE} CACHE STRING
-            "Default triple for which compiler-rt runtimes will be built.")
-    endif()
+    set(COMPILER_RT_DEFAULT_TARGET_TRIPLE ${LLVM_TARGET_TRIPLE} CACHE STRING
+          "Default triple for which compiler-rt runtimes will be built.")
   endif()
 
   string(REPLACE "-" ";" LLVM_TARGET_TRIPLE_LIST ${COMPILER_RT_DEFAULT_TARGET_TRIPLE})