Only print legalization warning if optimizer not enabled

Array rationalization

Disable DCE by Remapper through glslangValidator...

Add int16 support to AMD_trinary_minmax and AMD_shader_ballot

- Use much simpler method to update implicit array sizes.
  The previous overly complicated method was error prone.
- Rationalize all use of unsized arrays.
- Combine decorations when generating SPIR-V, to simplify
  adding extensions.

...now that spirv-opt is capable enough.

Update SPIRV-Tools known good.

Fix mixed array styles

Also update spirv-opt recipes.

There a couple functional problems, which when reduced down also led to
some good simplifications and rationalization.  So, this commit:
 - corrects "mixed" functionality: int[A] f[B] -> f[B][A]
 - correct multi-identifier decls: int[A] f[B], g[C] -> f and g are independently sized.
 - increases symmetry between different places in the code that do this
 - makes fewer ways to do the same thing; several methods are just gone now
 - makes more clear when something is copied or shared

This effects 60 tests, in a trivial way, but is critical to factor out this
noise from future planned changes.

Fixes #1304.

Should fix #1308.

Improve --auto-map-locations for uniforms (v2)

Add additional error check for fragment shader outputs

When assigning uniform locations it now takes into account the number
of locations occupied by the type. For uniforms, all types except
arrays and structs take up one location. For arrays the base location
count is multiplied by the array dimensions and for structs it is the
sum of the locations of each member.

Int64 and uint64 are disallowed as fragment shader outputs, similar to
double.

PP: don't give errors on some tokens under #if 0 (or similar).

Fixes #1295.

Tokens that are accepted by any version of HLSL or GLSL should be
allowed when #ifdef'd off, such that errors are not reported.

WIP: Implement SPV_GOOGLE_hlsl_functionality1.

Enabled via -fhlsl_functionality1

Add support for GL_NV_shader_noperspective_interpolation

Fix conversions

Use the correct type for the constant for matrix/scalar division

The base and shift amount need to be integers, but not of the same type.
This fixes #1296 and replaces #1297.

Historically, addConversion() was split to handle binary node <-> node conversions
from non-binary node -> type conversions. However, the split wasn't entirely clean
WRT HLSL design and left duplication of case statements, which are misleading, and
this commit cleans up.

Reinforces that conversion rules are operation-specific.
Side effect is that HLSL logical-operator conversions are more direct
(e.g. float -> bool, rather than float -> int -> bool).

Fix build several build errors

glslang/SPIRV/SpvBuilder.cpp:2533:27: error: comparison of integers of different signs: 'int' and 'size_type' (aka 'unsigned long') [-Werror,-Wsign-compare]
        for (int c = 0; c < accessChain.swizzle.size(); ++c)
                        ~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

glslang/hlsl/hlslParseHelper.cpp:69:5: error: field 'cullDistanceInput' will be initialized after field 'clipDistanceOutput' [-Werror,-Wreorder]
    cullDistanceInput(nullptr),
    ^
1 error generated.

glslang/glslang/MachineIndependent/attribute.cpp:85:16: error: comparison of integers of different signs: 'int' and 'size_type' (aka 'unsigned long') [-Werror,-Wsign-compare]
    if (argNum >= args->getSequence().size())
        ~~~~~~ ^  ~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

Replace en-dash with simple ASCII hyphen

* This means the source file is ASCII instead of (assumed) UTF-8 and
  doesn't cause warnings when compiling on non-western codepages.