This includes doing structure uniqueness modulo majorness, for shared nested structures.

This also distinguishes between the same struct included in multiple parent packings.

SPV: Fix an issue related with imageStore() for 2DMS.

Parser: Correct the storage qualifier of gl_HelperInvocation.

SPV: Implement GLSL built-in bitcast functions.

Display the filename if we have output, even if validating  a single file

This also made the function easier to read by identifying
left and right operands more clearly.

Fix compile warning/error due to assignment in while() loop

This causes build failures with -Werror=parentheses

An extra line of error recovery code set a non-sense combination of
es version and core profile.

'invocations' was using 0 as the "shader never set" flag and as the
default. Formalize this and explicit set to 1 and link time.

To do this, more generally use a named -1 as a not set value.

SPV: Smear should use type of the scalar to make the expected vector type when the provided vector type is incompatible with the scalar.

Parser: Extension requirement of gl_PrimitiveID and gl_Layer should be checked only for ESSL instead of GLSL.

expected vector type when the provided vector type is incompatible with
the scalar.

Parser: Extension requirement of gl_PrimitiveID and gl_Layer should be checked only for ESSL instead of GLSL.

SPV: Implement GLSL interpolation built-in functions.

Dealing with the 110 toolset seems not worth it.

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.