Handle buffer references vs 'const'

Allow constructors to and from references to be constant folded. Section 4.3.3
says constructors whose arguments are all constant expressions must fold.

Disallow 'const' on buffer reference types. It is not a 'non-void transparent
basic data type' (it is not considered 'basic').

Handle buffer reference constants (which can be assigned to a non-const reference,
or can be further folded to another type of constant) by converting to
'constructor(uint64_t constant)' in addConversion.

Disallow == and != operators on reference types.

Fix NV_EXTENSIONS-disabled build

Implement GL_NV_cooperative_matrix

PP: Fix #1605: Paste tokens for ## through number->letter transitions.

Fix -Wextra-semi warnings in headers used in Chromium

Fix type recursion with EOpIndexIndirect dereferences

* This primarily affects arrays-of-arrays but it can also affect arrays-of-
  structs if there are no further dereferences.

Update SPIRV-Tools known good

Allocate empty function name in the string pool.

Fixup leak of TString

In decomposeIntrinsic a new TString was being allocated and passed into
a TVariable. That string was leaking. This CL converts the new TString
to call NewPoolTString to allocate from the TString pool.

Inside the grammar for function_identifier if the .function is null an
empty function name is allocated. This is allocated on the stack and
passed into TFunction as a pointer. TFunction just stores that pointer.

Later, when we access the name we will receive an invalid usage of a
stack allocated variable. This CL switches to using NewPoolTStringn for
the empty function name.

PP: Remove sub-tokens in macro recording and record spaces correctly.

This fixes the comparison in macro body redefinitions, where initial
white-space differences do not matter, but internal white-space differences
do matter.

This has been a continually fragile area. Switching to a vector of real
objects, instead of a linearized stream of characters, removes a bunch of
code and generally makes this area more robust.

Fix treatment of array input/output variables in reflection

Fix resizing of gl_PrimitiveIndicesNV[] to max_primitives*geomSize

- This change also allows redeclaration of gl_PrimitiveIndicesNV and
  adds error checks against incorrect explicit array size.
- Also modifies gtests to check array bound limits and redeclare gl_PrimitiveIndicesNV[].

* Non-block arrays should not be ignored when exploding types.
* When not exploding, set the array size correctly on each item.

Add option to unwrap I/O block aggregates in reflection

* We follow similar rules to uniform block exploding.

Also added a warning for no space after a macro name.

Opt-in improvements to reflection interface

Add missing support for gl_MeshViewCountNV/gl_MeshViewIndicesNV in task shaders