There were lots of dodgy casts, wrong specifiers, or missing specifiers.
Could easily cause undefined behavior.

Bug: b/127433389
Change-Id: I2859993509b897d4a7c649f87ab74d440be4590c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29930
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>