Fix broken asserts that never fire.

Change assert("text") to assert(0 && "text").  The first case is a const char *
to bool conversion, which always evaluates to true, never triggering the
assert.  The second case will always trigger the assert.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185227 91177308-0d34-0410-b5e6-96231b3b80d8