replace unsigned only and float only varint calls with encode_varint!

[arhik]

• Replace encode_signed_varint with encode_varint for FloatIdentityOp bits since float_to_bits returns unsigned values

Also: Remove redundant encode_signed_varint overload in writer.jl that just wrapped encode_varint anyway

cuTile.jl/src/bytecode/writer.jl

Lines 293 to 302 in 2c52a53

	"""
	encode_signed_varint!(buf, value)
	Encode a signed integer as a variable-length integer.
	Uses zigzag encoding for signed values.
	"""
	function encode_signed_varint!(buf::Vector{UInt8}, value::Union{UInt16, UInt32, UInt64})
	# For float bits, encode as unsigned varint
	encode_varint!(buf, UInt64(value))
	end

[arhik]

Fixes #44 and Fixes #45