[llvm][DebugInfo] Emit 0/1 for constant boolean values (#151225) Previously, sign-extending a 1-bit boolean operand in `#DBG_VALUE` would convert `true` to -1 (i.e., 0xffffffffffffffff). However, DWARF treats booleans as unsigned values, so this resulted in the attribute `DW_AT_const_value(0xffffffffffffffff)` being emitted. As a result, the debugger would display the value as `255` instead of `true`. This change modifies the behavior to use zero-extension for 1-bit values instead, ensuring that `true` is represented as 1. Consequently, the DWARF attribute emitted is now `DW_AT_const_value(1)`, which allows the debugger to correctly display the boolean as `true`.
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