Also add WARN() and ASSERT_MSG().

Bug: b/127433389
Change-Id: I2549e9a79b3168cfc419d6564f0c111f95246452
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26148Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>