Improve overflow_underflow_toinf_0 test somewhat #3434
Merged
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Add test cases that will make explicit ±0.0 and ±INF appear in the AST output to make sure those cases are handled correctly.
Also, move overflow_underflow_toinf_0 from runtests to gtest. gtest is the preferred framework for simple tests that don't require passing special command-line options to glslang.