SPV: Prevent issue #415 with better semantic checking.

SPIRV/GlslangToSpv.cpp

@@ -2860,7 +2860,7 @@ spv::Id TGlslangToSpvTraverser::handleUserFunctionCall(const glslang::TIntermAgg
         builder.clearAccessChain();
         glslangArgs[a]->traverse(this);
         argTypes.push_back(&paramType);
-        // keep outputs as and opaque objects l-values, evaluate input-only as r-values
+        // keep outputs and opaque objects as l-values, evaluate input-only as r-values
         if (qualifiers[a] != glslang::EvqConstReadOnly || paramType.isOpaque()) {
             // save l-value
             lValues.push_back(builder.getAccessChain());