Steven Perron b3daa93b46 Change merge return pass to handle structured cfg. ... We are seeing shaders that have multiple returns in a functions. These functions must get inlined for legalization purposes; however, the inliner does not know how to inline functions that have multiple returns. The solution we will go with it to improve the merge return pass to handle structured control flow. Note that the merge return pass will assume the cfg has been cleanedup by dead branch elimination. Fixes #857.		2018-03-19 13:49:04 -04:00
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spirv-tools	Change merge return pass to handle structured cfg.	2018-03-19 13:49:04 -04:00