[SelectionDAG] Use SLEB128 for signed integers in isel table instead of 'signed rotated'. NFC (#173928) Previously, we used a VBR that stored the sign bit in bit 0 followed by the absolute value in subsequent bits. This patch changes it to use SLEB128 which discards redundant sign bits, but keeps the bits in the same positions. This uses the same number of bytes to encode values so doesn't change the table size. My goal is to remove OPC_EmitStringInteger as a special opcode type. Instead, we can print the string directly with OPC_EmitInteger for any string that has an enum value of 0..63.
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