Add an expected file for 094-divide-by-zero-short-circuit

The expected file here captures the current behavior of glcpp (which
is to generate a division-by-zero error) for this case.

It's easy to argue that it should be short-circuiting the evaluation
and not generating the diagnostic (which happens to be what gcc does).
But it doesn't seem like we should force this behavior on our
pre-processor, (and, as always, the GLSL specification of the
pre-processor is too vague on this point).

src/glsl/glcpp/tests/094-divide-by-zero-short-circuit.c

@@ -1,2 +1,13 @@
+/* glcpp is generating a division-by-zero error for this case.  It's
+ * easy to argue that it should be short-circuiting the evaluation and
+ * not generating the diagnostic (which happens to be what gcc does).
+ * But it doesn't seem like we should force this behavior on our
+ * pre-processor, (and, as always, the GLSL specification of the
+ * pre-processor is too vague on this point).
+ *
+ * If a short-circuit evaluation optimization does get added to the
+ * pre-processor then it would legitimate to update the expected file
+ * for this test.
+*/
 #if 1 || (1 / 0)
 #endif

src/glsl/glcpp/tests/094-divide-by-zero-short-circuit.c.expected

@@ -0,0 +1,15 @@
+0:12(17): preprocessor error: division by 0 in preprocessor directive
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