ReactorUnitTests: use FunctionT
ReactorUnitTests: use FunctionT

Bug: b/143479561
Change-Id: Id6039b31790eb181daf669dff43cd46f92d464d7
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/37748
Tested-by: Antonio Maiorano <86d87a6550afb6b07035c9743fa181900589f7e0@google.com>
Reviewed-by: Alexis Hétu <1c7141772178a7e80858c3db5052b328076f08f4@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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