Update spirv-tools known-good

Includes the following spirv-opt improvements:

Preserve inst-to-block and def-use in passes.
Add store for var initializer in inlining.
Handle types with self references.

Relax a stringToDouble test for, OSX AppleClang 9.1

1e-323 was flushed to zero.
1e-308 is also flushed to zero.
Use 1e-307 instead, which still satisfies the test intent.

Fixes #1400

The major version number was bumped in the previous commit to support
this.

Fix several signed/unsigned comparison compile warnings.

Update spirv-tools known-good.

Includes:

Fold FMix feeding Extract, and use the simplification pass.

CMake: use target_include_directories to expose includes

This makes glslang simpler to embed in larger projects.

Fix TextureUpgradeAndSamplerRemovalTransform when used with qualifiers

Add bit width of types to disassembleInstruction

PP: Fix strtod problems: add tests, remove 2nd use, replace

Fixes #1228. Fixes #234.

This uses imbue() to be locale independent.  Notes:

- 'sstream >> double' is much slower than strtod()
  * this was measurable in the test suite as a whole, despite being
    a tiny fraction of what the test suite does
- so, this embeds a fast path that bypasses sstream most of the time
  => the test suite is faster than before
- sstream is probably slower, because it does more accurate rounding than strtod()
- sstream does not create INFINITY by itself, this was done based on failure inferencing

This partly addresses #1228 and #234 by reducing usage of strtod (or atof).
There is now only place to parse a floating-point number.

- Adds a pragma to see binary output of double values (not portable)
- Print decimals that show more values, but in a portable way
  (lots of portability issues)
- Expand the tests to test more double values

Note: it is quite difficult to have 100% portable tests for floating point.
The current situation works by not printing full precision, and working around
several portability issues.

Update spirv-tools known-good

Includes:

Fold divide and multiply by same value.
Allow ADCE to remove more instructions.
Remove dead Workgroup variables in ADCE.
Fold fclamp feeding compare.
Add pass to fold a load feeding an extract.
Remove redundant stores.
SROA: Only create symbols that are loaded.
Get ADCE to handle OpCopyMemory
Remove the limit on struct size in SROA.

The transform removes sampler arguments from functions and function
calls; this causes function arguments to change their indices. When some
function arguments have an output qualifier, this qualifier can get lost
because of the removal which can lead to incorrect results (e.g. out
qualifier not having effect).

To fix this we iterate through both seq & qual arrays in lock-step and
manually remove/replace entries as appropriate.

HLSL: allow self-type cast (as no-op passthrough)

Previously, casting an object of a struct type to an identical type
would produce an error.  This PR allows this case.

As a side-effect of the change, several self-type casts in existing
tests go away.  For example:

    0:10          Construct float ( temp float)
    0:10            'f' ( in float)

becomes this (without the unneeded constructor op):

    0:10          'f' ( in float)

For vector or array types this can result in somewhat less overall code.

Fixes: #1218

HLSL: require coverage mask to be arrayed output.

Fix issue #1376: SPV_AMD_gpu_shader_half_float is not emitted under vulkan1.1

vulkan1.1

Interpolation functions, using 16-bit interpolants, should always emit
this extension string regardless of vulkan enviornment version.

SPIR-V requires the coverage mask to be an array of integers, but HLSL
allows scalar integers.  This adds the requisite type conversion and
wrapped entry point handling.

Fixes: #1202

HLSL: various SPIR-V compute shader IDs must be 3-vectors of integers

This PR forces the external definition of SV_GroupID variables to 3-vectors.
The conversion process between the shader-declared type and the external type
happens in wrapped main IO variable conversion.

The same applies to SV_DispatchThreadID and SV_GroupThreadID.

Fixes: #1371

HLSL: Allow stream output Append() method after entry point.

Append() method is special: unlike most outputs, it does not copy
some temporary data to a symbol in the entry point epilogue, but
rather uses an emit builtin after each write to the output stream.

This had been handled by remembering the special output symbol for
the stream as it was declared in the shader entry point before
symbol sanitization.  However the prior code was too simple and
only handled cases where the Append() method happened after the
entry point, so that the output symbol had been seen.

This PR adds a patching step so that the Append()s may appear in
any order WRT the entry point.  They are patched in an epilogue,
whereupon it is guaranteed in a well formed shader that we have
seen the appropriate declaration.

Fixes #1217.