Use the fast path for passing assertions in RunContext::handleNonExpr

`handleNonExpr` is responsible for handling assertions that do not
result in a decomposable expression, e.g. `REQUIRE_THROWS`, or
`REQUIRE_NOTHROW`.

Running benchmark on these two macros specifically, with
`REQUIRE_THROWS([](){ throw 1; }())`, and `REQUIRE_NOTHROW([](){}())`,
we get these speedups:

|         |  Debug | Release |
|---------|--------|---------|
| THROWS  |  3.69x |   2.10x |
| NOTHROW |  1.18x |   1.05x |

Obviously the actual performance improvement is dependent on
how expensive the expression under test is.

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