[llvm] Use LLVM_DEFAULT_TARGET_TRIPLE to find target libs (PR #72498)

[Shivam Gupta via llvm-commits]

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@@ -61,6 +61,8 @@ function(find_compiler_rt_library name variable)
   set(target "${ARG_TARGET}")
   if(NOT target AND CMAKE_CXX_COMPILER_TARGET)
     set(target "${CMAKE_CXX_COMPILER_TARGET}")
+  elseif(LLVM_DEFAULT_TARGET_TRIPLE)
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xgupta wrote:

` NOT target` is missing like it was their in above condition. Otherwise Look good.

https://github.com/llvm/llvm-project/pull/72498