Match index adds as well as base
Match index adds as well as base

BUG=
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/1421603003 .

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