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>

gtests/AST.FromFile.cpp

@@ -278,6 +278,8 @@ INSTANTIATE_TEST_SUITE_P(
         "glsl.es320.subgroupShuffleRelative.comp",
         "glsl.es320.subgroupQuad.comp",
         "glsl.es320.subgroupVote.comp",
+        "terminate.frag",
+        "terminate.vert",
     })),
     FileNameAsCustomTestSuffix
 );