Fixes issue !27.

Add python3 compatibility to update_glslang_sources.py

Both debug and release clang builds have segfaulted on recent
changes, non deterministically, while doing the single/multi-thread
test all test files. Removing recent test files, to see if it gives
a clue.

GLSL: Fold constant SHRT_MIN/INT_MIN/LLONG_MIN % -1 to 0.

The previous merge needs this hole filled, but filling
it as a separate commit.

GLSL: Check for implicit inner dimension in array of atomic_uint.

Preprocessor: Evaluate INT_MIN % -1 to 0.

Restore original canImplicitlyPromote implementation

See merge request !26

This change restores original canImplicitlyPromote implementation in
case the explicit type extension wasn't requested.

Update spirv-tools known-good

Only try swizzles on vectors, numbers, and booleans.

Merge branch 'only-parse-inf-constant-in-hlsl' of https://github.com/xorgy/glslang into xorgy-only-parse-inf-constant-in-hlsl

Check for hexadecimal literals exceeding MaxTokenLength.

Nonfunctional: minor: use std::array for per-set shifts, fix warning.

Two unrelated, minor tweaks:

(1) Use std::array for shiftBindingForSet.  Now matches shiftBinding.
(2) Add parens in shouldFlatten() to make compiler warning happy.

Add per-descriptor-set IO mapping shift values.

This PR adds the ability to provide per-descriptor-set IO mapping shift
values.  If a particular binding does not land into a per-set value,
then it falls back to the prior behavior (global shifts per resource class).

Because there were already 6 copies of many different methods and internal
variables and functions, and this PR would have added 6 more, a new API is
introduced to cut down on replication and present a cleaner interface.
For the global (non-set-specific) API, the old entry points still exist
for backward compatibility, but are phrased internally in terms of the
following.

    // Resource type for IO resolver
    enum TResourceType {
        EResSampler,
        EResTexture,
        EResImage,
        EResUbo,
        EResSsbo,
        EResUav,
        EResCount
    };

Methods on TShader:

    void setShiftBinding(TResourceType res, unsigned int base);
    void setShiftBindingForSet(TResourceType res, unsigned int set, unsigned int base);

The first method replaces the 6 prior entry points of various spellings, which
exist now in depreciated form.  The second provides per-resource-set functionality.
Both accept an enum from the list above.

From the command line, the existing options can accept either a single shift value as
before, or a series of 1 or more [set offset] pairs.  Both can be provided, as in:

    ... --stb 20 --stb 2 25 3 30 ...

which will use the offset 20 for anything except descriptor set 2 (which uses 25) and
3 (which uses 30).

Desktop defaults to highp for samplers, but this should not apply to the built-in
functions, so make it appy only to user declarations.

Preprocessor: Evaluate INT_MIN / -1 to 0.

HLSL: Partially flatten hierarchies, instead of all or nothing.