fix(llvm_backend): improve readability of basic value handling in bui… #10

Job	Run time
fmt + clippy	36s
runtime smoke	44s
parse conformance	44s
SIMD contract (Cranelift)	33s
type + lowering conformance	46s
backend features (default)	42s
backend features (llvm-backend)	1m 30s
	5m 35s

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