Front-ends: Remove now defunct afterEOF and related, use scanner's instead.

Code using atEndOfFile was dead, instead do something useful with
the scanners atEndOfInput().  This allows a better error message
for early termination of cascading errors.

hlsl/hlslParseHelper.cpp

@@ -55,7 +55,6 @@ HlslParseContext::HlslParseContext(TSymbolTable& symbolTable, TIntermediate& int
     contextPragma(true, false), loopNestingLevel(0), structNestingLevel(0), controlFlowNestingLevel(0),
     postMainReturn(false),
     limits(resources.limits),
-    afterEOF(false),
     entryPointOutput(nullptr)
 {
     // ensure we always have a linkage node, even if empty, to simplify tree topology algorithms

hlsl/hlslParseHelper.h

@@ -189,7 +189,6 @@ protected:
     HlslParseContext& operator=(HlslParseContext&);
 
     static const int maxSamplerIndex = EsdNumDims * (EbtNumTypes * (2 * 2 * 2)); // see computeSamplerTypeIndex()
-    bool afterEOF;
     TQualifier globalBufferDefaults;
     TQualifier globalUniformDefaults;
     TQualifier globalInputDefaults;