Silence dead code warning
Silence dead code warning

Clang produces:
"error: code will never be executed [-Werror,-Wunreachable-code]"
For code following an unconditional `break`. But it hints that:
"note: silence by adding parentheses to mark code as explicitly dead"

Hence the dead code can follow an "if((true)) break;" without producing
the warning/error.

Note that in this instance we could have just removed the dead code, but
I wanted to make it clear that this is an example of an unfinished
Reactor function.

Bug: b/178929463
Change-Id: I1ea4dac91877fcede189d09e3953568b2813129e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/52288
Tested-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Kokoro-Result: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Antonio Maiorano <86d87a6550afb6b07035c9743fa181900589f7e0@google.com>

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