The spec states that "Applications must not pass any other values than
VK_TRUE or VK_FALSE into a Vulkan implementation where a VkBool32 is
expected." So we should avoid the use of C++ true/false and literal 0/1
when dealing with VkBool32 values.

Note that we test for 'condition != VK_FALSE' to evaluate whether the
condition should be interpreted as true. This is both more efficient
than testing for 'condition == VK_TRUE' and follows the principle of
least surprise in the event an application does provide another value.

Bug: b/134584057
Change-Id: I219172a2c538b0f0cb3f173ffd905adb8814b932
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/32408
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>