In preparation for SPIRV-Tools change where its internals
use the C++11 headers.
This patch works with SPIRV-Tools using the old C header
and using the C++11 header.
This patch includes some complex machinery inside "three_sided_patch"
namespaces that can be removed after third_party/vulkan-deps/spirv-tools has
fully transitioned into using the C++11 headers.
Change-Id: I36f358fe3edcc5e613625708017fb8d7919c40c6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/108780
Reviewed-by: Alan Baker <alanbaker@google.com>
Commit-Queue: David Neto <dneto@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
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