Much about const or temp is mechanical, about actual declaration,
while much is semantic, about something higher level.  This commit
checks every use everywhere, and for the high-level ones, substitutes
an encapsulated version instead.

Parser: Type promotion for operator modulus(%) is missing.

Support Linux-to-Windows cross compile via MinGW

Change-Id: Ie52f0b1b2b20948c6f4b3cb5474537d36a5a3385

SPV: Implement boolean selection for mix().

Use OpSelect to implement boolean selection of mix(). FMix is applicable
to linear blending of mix().

SPV test: Test dead-decoration removal.

SPV: Remove decoration of undefined IDs

Preprocessor: Fix array out of bounds bug in processing if-else-endif macros.

Fix issue #185 by removing OpDecorate instructions whose target IDs are
defined in unreachable blocks and thus not dumped in the generated
SPIR-V code.

If we are not inside an if macro, we cannot simply decrease
elsetracker.

Fixes https://github.com/KhronosGroup/glslang/issues/29.

SPV: Declare MultiViewport capability.

Fix issue #191:
https://github.com/KhronosGroup/glslang/issues/191

SPV: Add support for memory qualifiers.

SPV: Support the new OpCode - OpImageSparseRead

Remove bison binary

SPV: Continue to fix the issue of bool -> uint32

Fix line endings in Test/100.conf

For short-circuit operator (&& and ||), the conversion is missing.

SPV: Fix an issue caused by bool-to-uint32 conversion.

Fix compilation issues with MSVC 2010

Minor warning fixes

Fix warnings/errors for strict aliasing & function prototypes