This highly leverages the previous commit to handle partial initializers.

A way to query "location" qualifier for vertex attributes, using TProgram reflection API

HLSL: Add GS support

HLSL: use HLSL parser for HLSL intrinsic prototypes, enable int/bool mats

HLSL: allow "sample" as a valid identifier.

Adding a way to retrieve vertex attribute TType using TProgram reflection API (required in order to query location attributes).

This PR adds:

[maxvertexcount(n)] attributes

point/line/triangle/lineadj/triangleadj qualifiers

PointStream/LineStream/TriangleStream templatized types

Append method on above template types

RestartStrip method on above template types.

HLSL has keywords for various interpolation modifiers such as "linear",
"centroid", "sample", etc.  Of these, "sample" appears to be special,
as it is also accepted as an identifier string, where the others are not.

This PR adds this ability, so the construct "int sample = 42;" no longer
produces a compilation error.

New test = hlsl.identifier.sample.frag

This PR adds a CreateParseContext() fn analogous to CreateBuiltInParseables(),
to create a language specific built in parser.  (This code was present before
but not encapsualted in a fn).  This can now be used to create a source language
specific parser for builtins.

Along with this, the code creating HLSL intrinsic prototypes can now produce
them in HLSL syntax, rather than GLSL syntax.  This relaxes certain prior
restrictions at the parser level.  Lower layers (e.g, SPIR-V) may still have
such restrictions, such as around Nx1 matrices: this code does not impact
that.

This PR also fleshes out matrix types for bools and ints, both of which were
partially in place before.  This was easier than maintaining the restrictions
in the HLSL prototype generator to avoid creating protoypes with those types.

Many tests change because the result type from intrinsics moves from "global"
to "temp".

Several new tests are added for the new types.

Add UAV (image) binding offset and HLSL register class support

SPV: The execution scope for barriers should be Workgroup.

SPV: Fix unreferenced variable warning with AMD_EXTENSIONS disabled.

HLSL: allow promotion from 1-vector types to scalars, e.g, float<-float1

Previously, an error was thrown when assigning a float1 to a scalar float,
or similar for other basic types.  This allows that.

Also, this allows calling functions accepting scalars with float1 params,
so for example sin(float1) will work.  This is a minor change in
HlslParseContext::findFunction().

HLSL: Allow expressions in attributes

For example:

[numthreads(2+2, 2*3, (1+FOO)*BAR)]

This will result in a thread count (4, 6, 8).

Rationalizes the entire tracking of the linker object nodes, effecting
GLSL, HLSL, and SPIR-V, to allow tracked objects to be fully edited before
their type snapshot for linker objects.

Should only effect things when the rest of the AST contained no reference to
the symbol, because normal AST nodes were not stale. Also will only effect such
objects when their types were edited.

This PR adds:

1. The "u" register class for RW* objects.

2. --shift-image-bindings (== --sib), analogous to --shift-texture-bindings etc.

3. Case insensitive reg classes.

4. Tests for above.

Fix build warnings in iomapper.cpp, re-indent to glslang standard

This has no functional changes.

HLSL: implement numthreads for compute shaders

HLSL -> Spir-V: Resource mapping handler

HLSL: Add min*{float,int,uint} types

Use std::atoi instead of std::stoi

Some Android cross cross-compilers don't have std::stoi.

E.g. i686-linux-android-g++ from Android NDK r10e don't have std::stoi.

These HLSL types are guaranteed to have at least the given number of bits, but may have more.

min{16,10}float is mapped to EbtFloat at medium precision -> SPIRV RelaxedPrecision
min{16,12}int and min16uint are mapped to mediump -> SPIR-V RelaxedPrecision

This PR adds handling of the numthreads attribute for compute shaders, as well as a general
infrastructure for returning attribute values from acceptAttributes, which may be needed in other
cases, e.g, unroll(x), or merely to know if some attribute without params was given.

A map of enum values from TAttributeType to TIntermAggregate nodes is built and returned.  It
can be queried with operator[] on the map.  In the future there may be a need to also handle
strings (e.g, for patchconstantfunc), and those can be easily added into the class if needed.

New test is in hlsl.numthreads.comp.

Add explicit lambda return types, for compilers without C++14 support

- add optional callback to handle mapping of uniform variables in linking phase
- if no resolver is provided, it uses the internal default resolver with all shifts and auto bind settings

Change-Id: Icfe38a9eabe8bfc8f8bb6d8150c06f7ed38bb762