Optimize stores in a single basic block.
Optimize stores in a single basic block.

Bug swiftshader:27

Change-Id: Ia5f7da431902c3e87aab47b1dd388e05ced74cd3
Reviewed-on: https://swiftshader-review.googlesource.com/8274
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Reviewed-by: Alexis Hétu <1c7141772178a7e80858c3db5052b328076f08f4@google.com>
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,google/swiftshader