Instead of these becoming an integer literal internally, they now become bits<n> values.
Prior to this change, 0b001 was 1 bit long. This is confusing as clearly the user gave 3 bits.
This new type holds both the literal value and the size, and so can ensure sizes match on initializers.
For example, this used to be legal
bits<1> x = 0b00;
but now it must be written as
bits<2> x = 0b00;
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215084 91177308-0d34-0410-b5e6-96231b3b80d8
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