[llvm] Unify x64 and arm64 build process in build_llvm_release.bat (PR #131687)

[Omair Javaid via llvm-commits]

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@@ -192,8 +196,6 @@ set "stage0_bin_dir=%build_dir%/build32_stage0/bin"
 set cmake_flags=^
   %common_cmake_flags% ^
   -DLLVM_ENABLE_RPMALLOC=OFF ^
-  -DLLDB_TEST_COMPILER=%stage0_bin_dir%/clang.exe ^
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omjavaid wrote:

Yes this is not needed as LLDB now picks up clang from bin directory as the default compiler and we are not even building LLDB during stage0 so this was redundant.
We run lldb tests during AArch64 Windows release builds. There are some failures here n there due to flaky nature of LLDB API tests.

https://github.com/llvm/llvm-project/pull/131687