[Feature Request] is_compile_time should return Bool

[soraros]

Review Mojo's priorities

• I have read the roadmap and priorities and I believe this request falls within the priorities.

What is your request?

As title. CC @JoeLoser.

What is your motivation for this change?

Now it returns a i1, so we can't write code like if not is_compile_time(): .... Maybe we should wrap it in a function.

max/mojo/stdlib/src/sys/compile.mojo

Lines 22 to 25 in 89cfffc

	alias is_compile_time = __mlir_op.`kgen.is_compile_time`
	"""Returns true if the current code is executed at compile time, false
	otherwise.
	"""

Any other details?

N/A