[clang] [NFC][clang] Split clang/lib/CodeGen/CGBuiltin.cpp into target-specific files (PR #132252)

[Sergei Barannikov via cfe-commits]

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@@ -61,6 +61,16 @@ add_clang_library(clangCodeGen
   CGAtomic.cpp
   CGBlocks.cpp
   CGBuiltin.cpp
+  TargetBuiltins/AArch64.cpp
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s-barannikov wrote:

(nit) Move these filenames down the list to keep it sorted?

https://github.com/llvm/llvm-project/pull/132252