Track what ins/outs/uniforms are used, so that errors like "declare after use" or "can't use both XXX and YYY" can be issued. So far, used this for invariant, gl_FragColor et. al., and gl_FragCoord use before redeclaration.

Also made all tests in testlist include linker tests.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24156 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/330.frag

@@ -7,8 +7,8 @@ varying vec4 varyingVar;
 
 void main()
 {
-    gl_FragColor = varyingVar;
-    gl_FragData[1] = inVar;
+    gl_FragColor = varyingVar;  // link ERROR: user output was used
+    gl_FragData[1] = inVar;     // link ERROR: user output was used
     int buffer = 4;
 }
 
@@ -21,4 +21,5 @@ in gl_PerFragment {
 void foo()
 {
     vec4 c = gl_Color;
+    outVar = inVar;
 }