* 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
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
