Implement GL_EXT_terminate_invocation (#2454)

* Implement GL_EXT_terminate_invocation.

* terminateInvocation: declare the SPV extension

* Update test results for spirv-tools and bison version bumps

Co-authored-by: John Kessenich <cepheus@frii.com>

SPIRV/GlslangToSpv.cpp

@@ -3458,6 +3458,10 @@ bool TGlslangToSpvTraverser::visitBranch(glslang::TVisit /* visit */, glslang::T
     case glslang::EOpKill:
         builder.makeDiscard();
         break;
+    case glslang::EOpTerminateInvocation:
+        builder.addExtension(spv::E_SPV_KHR_terminate_invocation);
+        builder.makeTerminateInvocation();
+        break;
     case glslang::EOpBreak:
         if (breakForLoop.top())
             builder.createLoopExit();