Pretend that enum constants have enum type when inferring a block return type.

In C, enum constants have the type of the enum's underlying integer type,
rather than the type of the enum. (This is not true in C++.) This leads to
odd warnings when returning enum constants directly in blocks with inferred
return types. The easiest way out of this is to pretend that, like C++, enum
constants have enum type when being returned from a block.

<rdar://problem/11662489>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158899 91177308-0d34-0410-b5e6-96231b3b80d8

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