[Clang][AST][NFC] Add assertion on Init to CompoundLiteralExpr (#152593)

Static analysis complained that:

  child_range(&Init, &Init+1);

in the children member function was potentially out of bounds. This is
false b/c it is forming an iterator range but it would be invalid if
Init was a nullptr.

I add an assertion in the constructor for this and remove to FIXME
checks that are related to this. I checked the various usages and we
always valid the argument is not nullptr.

0 files changed, 0 insertions, 0 deletions