Track changes in SPIRV-Headers for SPIR-V 1.1 rev 2.

Track changes in SPIRV-Headers for SPIR-V 1.1 rev 2.

* The `Input` StorageClass doesn't require the `Shader` capability
  anymore.
* The `Sampled1D` and `SampledBuffer` capabilities don't require
  the `Shader` capability anymore. So they do not indirectly
  depend on the `Matrix` capability. So are the `Image1D` and
  `ImageBuffer` capabilities, which depend on `Sampled1D` and
  `SampledBuffer`.

A new GLSL grammar file is uploaded for SPIR-V 1.1, but it's the
same as the existing one for SPIR-V 1.0.

Now tracking commit 3814effb879ab5a98a7b9288a4b4c7849d2bc8ac in
SPIRV-Headers.