This was tested by using __writeeflags(__readeflags() | 0x40000) to
enable alignment checks on x86.

Bug: b/169957911
Change-Id: Ie97b2fda281548fac94b13abe93213a9a1495b0c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/48929Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Sean Risser <srisser@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>