Change infrastructure to support constant folding across built-in functions, as required by 1.2 semantics. Partially fleshed out with min/max and some trig functions. Still have to complete all operations.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@20806 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/glslang.l

@@ -105,7 +105,7 @@ int yy_input(char* buf, int max_size);
 
 
 %%
-<*>"//"[^\n]*"\n"     { /* ?? carriage and/or line-feed? */ };
+<*>"//"[^\n]*"\n"     { /* CPP should have taken care of this */ };
 
 "attribute"    {  pyylval->lex.line = yylineno; return(ATTRIBUTE); }  // TODO ES 30 reserved
 "const"        {  pyylval->lex.line = yylineno; return(CONST); }