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 <bclayton@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>

src/Pipeline/SpirvShader.cpp

@@ -719,7 +719,9 @@ namespace sw
 			case spv::OpTypeVector:
 			case spv::OpTypeMatrix:
 			case spv::OpTypeArray:
+			case spv::OpTypeRuntimeArray:
 			{
+				// TODO: b/127950082: Check bounds.
 				auto stride = getType(type.element).sizeInComponents;
 				auto & obj = getObject(indexIds[i]);
 				if (obj.kind == Object::Kind::Constant)