[clang] [Clang][Driver] Revise Cygwin ToolChain to call linker directly (PR #147960)

[Tomohiro Kashiwada via cfe-commits]

================

----------------
kikairoya wrote:

You can remove this line if you want to check `--disable-high-entropy-va` in the `CHECK-ASLR`/`CHECK-64-ASLR` blocks, as it is redundant. Otherwise, you can merge those blocks into the `CHECK` block above and `CHECK-64` here, respectively.

https://github.com/llvm/llvm-project/pull/147960