To ensure back branches always go to a header block, create a header
block even for !testFirst loops.  Then unify common code between the
testFirst/!testFirst cases.

Generate the header-block code first, so update golden files.

Realize that certain infinite loops generate invalid SPIR-V, so put a
TODO to instead abort code generation in such cases.

Change-Id: I1e173c8f73daad186cfc666b7d72bd563ed7665d

Also update breakForLoop and call builder.closeLoop() in code
generation.

Remove dead code.

Change-Id: Ic8ce5b208530f8787989ef45a2efa405f1b45310

Also remove dead code.

Change-Id: I2c0177d8cab48b7d6f9442715aecb7951597f3c8

Change-Id: I5b53cc008349afad94b14500506fcab4d6e64d2e

Add a test for loop without a condition.

Change-Id: Idd7fc462218a84b1e745207e2975a3f2897d30a0

Change-Id: Id3bdf8b7a5606e7ce5d856ef225d5ddbe59a584b

Avoid read past end of operands vector for EOpFrexp

When emitting SPIR-V code for frexp, avoid access
beyond the end of the operands vector.  When constructing
the OpExtInst, construct a new arguments vector instead of
modifying the existing operands vector.  In the case of OpFrexp,
well need that last operand later on to generate the store.

Fixes https://github.com/KhronosGroup/glslang/issues/110

Change-Id: Ibc380fadf5e600ac491932e9ecef7afe2d72fd7f

SPV: Distinguish between std140 and std430 layouts, and correctly use alignments as the base for strides.

Scanner optimisations

In addUnaryMath, check for 'child' being null before dereferencing it.

Fail InitProcess() when InitThread() fails.

Fix ordered pointer comparison build warning/error

Use generic osinclude.h.

Using platform-neutral osinclude.h makes it easier to substitute
implementation when necessary and eliminates some variability between
build configurations.

Also, generally allow ES variable indexing of in/out blocks.

Handles the case of
    float[] x = float[] (1.0, 2.0, 3.0),
            y = float[] (1.0, 2.0, 3.0, 4.0);
where a shallow copy of the type arrayness from the left-most float[]
was getting used twice.

SPV: Fix an issue related with using CubeArrayShadow for texture()

Build: Use common osinclude.h header file that redirects per-platform, remove obsolete build files, enforce relative includes.

* Linux folder has been renamed to Unix, to match defines and so that it
  compiles on OS X.
* This removes the need for a per-platform include search path for the
  right OS folder

* This also moves bison generated files into the source tree, so that
  include of glslang_tab.cpp.h and includes from glslang_tab.cpp work
  the same way.

There is no calls to the TPpContext that could change the current input,
so every calls to pp->getChar and pp->ungetChar ultimately call this->getch
and this->ungetch while adding overhead of virtual calls and vector::back.

Remove obsolete unistd.h file

The presence of this file can cause build issues when integrating glslang
into other projects.

Various build fixes when using newer GCC versions with warnings enabled

Encountered with GCC-4.7.3 in a build environment where warnings are enabled
and treated as errors.