Fixes [#141505](https://github.com/llvm/llvm-project/issues/141505) The main intention behind this PR is to update the LibCTargetArchitecture for arm64 to use the implementation of aarch64 architecture and not arm32. This is a historical issue , and is a blocker to issue #138407. The intended fix is to set the `LibCTargetArchitecture` to aarch64 when it matches arm64 , this in turn would help us run darwin/aarch64 specific code on our MacOs pipeline in the git actions. Methods used to search and find "darwin/arm" directories was 1. "find . -type d -path "*/libc/*/darwin/arm" in a linux terminal to check for arm specifically 2. "find . -type d -path "*/libc/*/darwin/*" to ensure there are no directories that are named "*arm*" where star is a wildcard for any character.
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