This results in better error recovery, including fewer
crashes on badly formed PP input.

Include spirv-remap.exe in AppVeyor artifacts

script: Improve update sources script

- remove unused variable to pass pylint
- Use another approach to detect if known-good remote is already
  present to avoid the need for "ignore following errors" message.

Build: Make literal casting have fewer warnings and be more consistent.

Add support for OpConstantNull and OpConstantSampler to spirv-remap

Fixes issue #1408

This reverts commit ebec9094.

Khronos decided glslang was originally correct, and the specifications
are incorrect.

Take into account arrays of opaque types with --auto-map-bindings

TDefaultIoResolverBase::reserveSlot and getFreeSlot now have a size
parameter to reserve a range of bindings. This is used by
TDefaultIoResolver::resolveBinding to reserve a continuous range when
the type is an array and the target API is GL.

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.