Fixed bug with checking the kind of types.

The isLValueReferenceType function checks to see if the QualType's
canonical type is an LValue reference, and not if the QualType
itself is an LValue reference.  This caused a segfault when trying
to cast the QualType's Type to a LValueReference.  This is now
fixed by casting the result of getCanonicalType().

In addition, a test was added to isConsumableType to prevent
segfaults when a type being tested by the analysis is a reference
to a pointer or a pointer to a reference.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193751 91177308-0d34-0410-b5e6-96231b3b80d8