Allow 3d texture layers for framebuffer blit
Allow 3d texture layers for framebuffer blit

b/135141616

Change-Id: Ia3c804c0bef7a000a54359d24dcd8bacc063a121
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33508
Tested-by: Lingfeng Yang <5d5cebce725832b3958328c139d30096dabd51dd@google.com>
Kokoro-Presubmit: Lingfeng Yang <5d5cebce725832b3958328c139d30096dabd51dd@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>

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