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[libc] Make
BigInt
bitwise shift consistent with regular integral s…
…emantics. This patch removes the test for cases where the shift operand is greater or equal to the bit width of the number. This is done for two reasons, first it makes `BigInt` consistent with regular integral bitwise shift semantics, and second it makes the shift operation faster. The shift operation is on the critical path for `exp` and `log` operations, see llvm#86137 (comment).
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