CMakeLists: Add missing LLVM aarch64 source files.
CMakeLists: Add missing LLVM aarch64 source files.

Bug: b/134790440
Change-Id: I198b98a929e87d7cd80887535be1bf5c4724d946
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/32651
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Tested-by: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader