Reactor: Hook up atomic load/store intrinsics.
Reactor: Hook up atomic load/store intrinsics.

These may be required with the new SIMD::Load and SIMD::Store implementations.

Bug b/127472316
Test: dEQP-VK.spirv_assembly.instruction.compute.opatomic.load
Test: dEQP-VK.spirv_assembly.instruction.compute.opatomic.store

Change-Id: I89db49d7c27c268d37d1bb768adfefd99c11c7c0
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29449
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Tested-by: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>

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