Refactor size class calculation for larger sizes.#315
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Combines the addition of the base index (120) into the numerator before the right shift, making the calculation slightly more compact. The mathematical result is unchanged. [Savings](https://godbolt.org/z/nGj68h8Kv) on x86: 1. 1 instruction 2. 2 byte. 3. 1 cycle for large allocs. PiperOrigin-RevId: 944464841
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Refactor size class calculation for larger sizes.
Combines the addition of the base index (120) into the numerator before the right shift, making the calculation slightly more compact. The mathematical result is unchanged.
Savings on x86: