[clang] [Driver] Clean up unused architecture related bits for *BSD's (PR #69809)

[Brad Smith via cfe-commits]

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@@ -191,11 +191,6 @@
 // RUN:   | FileCheck -check-prefix=CHECK-MIPS64-CPU %s
 // CHECK-MIPS64-CPU: "-target-cpu" "mips3"
 
-// Check that the integrated assembler is enabled for SPARC64
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brad0 wrote:

I already removed the other OS specific tests as I enabled IAS across the board awhile ago.

https://github.com/llvm/llvm-project/pull/69809