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[SimplifyCFG] Delete the unnecessary range check for small mask opera…
…tion When the small mask value little than 64, we can eliminate the checking for upper limit of the range by enlarge the lookup table size to the maximum index value. (Then the final table size grows to the next pow2 value) ``` bool f(unsigned x) { switch (x % 8) { case 0: return 1; case 1: return 0; case 2: return 0; case 3: return 1; case 4: return 1; case 5: return 0; case 6: return 1; // This would remove the range check: case 7: return 0; } return 0; } ``` Use WouldFitInRegister instead of fitsInLegalInteger to support more result type beside bool. Fixes llvm#65120
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