SpirvShader: Handle OpTypeRuntimeArray in WalkAccessChain.
SpirvShader: Handle OpTypeRuntimeArray in WalkAccessChain.

Fixes tests that turned from PASS -> CRASH by adding compute shader support.

Bug: b/120799499
Change-Id: I72190eef98223851cba3d61a98d54ab2f6e2a0a7
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26553
Tested-by: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>
Reviewed-by: Chris Forbes <c3279c50043e18e9442c1ae071cafa0e7a4ca967@google.com>

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