Built-in symbol tables now lazily evaluated, and driven by per version, per profile input. Got all ES 100 and ES 300 built-in symbols correct.

This includes
 - doing prescan of shader to know version/profile before parsing it
 - putting precision qualifiers on built-in ES symbols
 - getting most built-in state correct for core/compatibility/missing profile
 - adding gl_VertexID and gl_InstanceID, among other ES 300 built-in symbols
 - adding the ES 300 gl_Max/Min constants
 - accepting shaders that contain nothing but whitespace without generating an error


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@20627 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/comment.frag

@@ -0,0 +1,12 @@
+	 
+	  //
+/* anotehn t* ontuh * / tnoahnt /* oo */
+/* multi line...
+
+ao */
+/*  no escape \
+oanot */
+// escape nothing \o oeu
+// escape newline \
+still in a comment
+

Test/pointCoord.frag

@@ -1,4 +1,4 @@
-precision mediump float;
+precision highp float;
 
 uniform sampler2D sampler;
 

Test/testlist

@@ -18,4 +18,5 @@ cppNest.vert
 cppComplexExpr.vert
 pointCoord.frag
 array.frag
-array100.frag
+array100.frag
+comment.frag