This patch implements the set boolean condition instructions introduced in POWER10.
The set boolean condition instructions (set[n]bc[r]) are used during these situations:
- sign/zero/any extending i1 to an i32 or i64,
- reg+reg, reg+imm or floating point comparisons being sign/zero extended to i32 or i64,
- spilling CR bits (using the setnbc instruction
Depends on D86252.
nit: indentation