A statement like "If(Bool(b)) {}" would lead to interpreting part of its
maco expansion "IfElseData ifElse__(Bool(b));" as a function declaration.

See https://en.wikipedia.org/wiki/Most_vexing_parse

Fix it by using C++11 universal initialization syntax.

Bug: b/155148722
Change-Id: I64d0a28f64a4735a61776a44dfb7560d2854cde3
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/49808
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>