PATCH: fix assertion failure in assignment if an lvalues is constant but its type is not const-qualified

[John Garvin]

Say we have an expression E that is constant because it’s in a constant address space, but its type is not actually const-qualified. In CheckForModifiableLvalue in SemaExpr.cpp, if isModifiableLvalue returns MLV_ConstQualified, it calls isReferenceToConstCapture. It may be MLV_ConstQualified either because the type is actually “const” or because it’s in the OpenCL constant address space (see ExprClassification.cpp:608). Unfortunately, isReferenceToConstCapture asserts that the type must actually be “const”, which is not necessarily true. This patch changes the assertion to what I think is intended.

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