This is to avoid all need to do text comparison of built-in function names
when consuming the AST.  All built-in functions get enumerants.

Will want to turn on soon.  See PureOperatorBuiltins.  See issue #8.

Add more TOperator: fma/frexp/ldexp, AddCarry/SubBorrow/MulExtended/Bit*/Find*, (un)pack4x8/2x32, ftransform.

Also corrects some existing ones missing the "Op" part of their name.

Fixes for compiling glslang on Android.

Primarily fix is due to Android not supporting std::to_string().

Fix two multi-sample bugs: 1) include MS in name mangling, 2) add 'sample' argument texelFetch(*MS*,...).

Fixed VS2015 build

SPIR-V: Return undefined values from implicit returns instead of dummy

Add missing OpTypeSampledImage to prevent unknown type error from SPV…

Previously if a non-void function implictly returned, a dummy variable
was created as return value. Now instead it returns the result of the
OpUndef instruction. This better conveys the presence of undefined
behavior to SPIR-V consuming tools (and humans).

It also saves one ID per occurrence...

There will be subsequent commits to refine semantics, esp. version-specific semantics,
as well as I/O functionality and restrictions.

Note: I'm getting white-space differences in the preprocessor test results,
which I'm not checking in.  I think they need to be tagged as binary or something.

Added some const as well. This will remove camouflage of the next commit,
which will add the bulk of Array of Array semantics and functionality.
(Note the basic grammar and data structure is already in place.)

Add getStringNameOrNum() in TSourceLoc.

Compile fixes for gcc -Wall

Remove unsigned/size_t downcast (warning when building on x64)

Remove unused members from TPpContext

The ErrMsg and ifloc members were unused or had no effect.

#include directive support

Now extensions required by preprocessor should be checked via
the ppRequireExtensions method. This is more clear and coherent
with the rest of the code.

Revisioning: Include GLSL.std.450 version.  Also, the revision.h script now includes redirection to revision.h.

The new make-revision script regenerates glslang/Include/revision.h,
used as it always has been, but made with a git-tag version and the
the number of commits on master.

I have a pre-commit hook that will automatically do this on master,
likely often enough to work in practice, without needing pull requests
to include it.