[Mono-dev] [PATCH] Fold a + 'b' + c to a + "b" + c in mcs

[Ben Maurer]

Today I noticed a perf issue in corlib in a place where we did a + 'b' +
c. The constant char in this case needs to be boxed and a string
allocated for its value. A better way to write this is a + "b" + c,
which saves two allocations.

The attached patch does this at the mcs level. The pattern occurs a few
times in the mono classlibs, so this appears to be generally useful.

-- Ben
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