Reactor: Fix cast from bool -> RValue<Bool>.
Reactor: Fix cast from bool -> RValue<Bool>.

This was previously taking the IntLiteral<T> path, resulting in an integer type instead of a bool type.

Bug: b/128636885
Change-Id: I1a36a7ba0e7009431dc44645f90454d389be721b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27250
Presubmit-Ready: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Tested-by: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>

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