[X86] Use the CPUKind enum from PROC_ALIAS to directly get the CPUKind in fillValidCPUList.
[X86] Use the CPUKind enum from PROC_ALIAS to directly get the CPUKind in fillValidCPUList.

We were using getCPUKind which translates the string to the enum also using PROC_ALIAS. This just cuts out the string compares.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@356686 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang