Function LLVMGetNamedFunctionWithLength 

pub unsafe extern "C" fn LLVMGetNamedFunctionWithLength(
    M: LLVMModuleRef,
    Name: *const c_char,
    Length: usize,
) -> LLVMValueRef

Obtain a Function value from a Module by its name.

The returned value corresponds to a llvm::Function value.

@see llvm::Module::getFunction()