GLSLTest_ES31.StructArraySample and
ComputeShaderTest.DispatchComputeIndirect both hit stack-buffer-overflow
errors with ASAN enabled, using the vulkan backend. Right now ASAN is
only tested on Mac, so these are only hit when Mac is using
swiftshader-vulkan.

Bug: 1029378
Change-Id: Ie590f73c29be44f683fd47fe4da139e1b5f96289
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1943408Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>