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

Update SPIRV-Tools and tests expectations

* The stages mask is more fine-grained, and each variable or block's mask
  indicates which stages it's active in.

* Also note the uniform indices of atomic counter buffers

* We add an option to reflect inputs from other stages than vertex, if only a
  later subset of the stages is linked into the program.