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* Add Metal Shading Language version options to shaderc. Reference version options from: https://developer.apple.com/documentation/metal/mtllanguageversion?language=objc Add configuration options for MSL compiler based on MSL version and Platform Configure MSL->SPIR-V version configuration based on when ray tracing types become available Set default metal compiler option to be metal 1.2, which is the default version assigned in the current SPIRV-Cross being used * Add Metal Shading Language version options to shaderc. Reference version options from: https://developer.apple.com/documentation/metal/mtllanguageversion?language=objc Add configuration options for MSL compiler based on MSL version and Platform Configure MSL->SPIR-V version configuration based on when ray tracing types become available Set default metal compiler option to be metal 1.2, which is the default version assigned in the current SPIRV-Cross being used * Group ios and osx platform code paths Reduce the size of temp buffer used in writing the MSL preprocessor define Fix a compiler warning about size_t to int32_t truncation Adjust whitespace in usage text * Remove indented scope left-over from branch condition removal * Remove some testing code * Adjust whitespace for function arguments * Replace BX_ASSERT with bx::write to message handler in spirv generation