[clang] [Driver] Implement ToolChain on Haiku (PR #66038)

[Fangrui Song via cfe-commits]

================
@@ -15,30 +15,58 @@
 
 namespace clang {
 namespace driver {
+namespace tools {
+
+/// haiku -- Directly call GNU Binutils assembler and linker
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MaskRay wrote:

Do not recommend repeating the identifier name `name -- ` in new code.

https://github.com/llvm/llvm-project/pull/66038