[GCC 11] [COMMITTED] Do not continue propagating values which cannot be set, properly.

[Andrew MacLeod]

If the on-entry cache cannot properly represent a range, do not continue 
trying to propagate it.  Adapted version of a GCC 12 patch which works 
in conjuction with the sparse on entry cache update.

Bootstrapped on x86_64-pc-linux-gnu with no regressions. pushed.

Andrew


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