cranelift-wasm: expose cranelift-frontend's FunctionBuilder in the public API;

cranelift/wasm/src/lib.rs

@@ -70,6 +70,7 @@ pub use crate::translation_utils::{
     DefinedTableIndex, ElemIndex, FuncIndex, Global, GlobalIndex, GlobalInit, Memory, MemoryIndex,
     SignatureIndex, Table, TableElementType, TableIndex,
 };
+pub use cranelift_frontend::FunctionBuilder;
 
 /// Version number of this crate.
 pub const VERSION: &str = env!("CARGO_PKG_VERSION");