PP: Rationalize return values of MacroExpand.
This results in better error recovery, including fewer crashes on badly formed PP input.
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4
Test/baseResults/preprocessor.bad_arg.vert.err
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4
Test/baseResults/preprocessor.bad_arg.vert.err
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@@ -0,0 +1,4 @@
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ERROR: 0:8: 'macro expansion' : End of input in macro EXP2
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ERROR: 1 compilation errors. No code generated.
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