Switch from memmap to memmap2.

See https://rustsec.org/advisories/RUSTSEC-2020-0077

cranelift/filetests/Cargo.toml

@@ -21,7 +21,7 @@ file-per-thread-logger = "0.1.2"
 filecheck = "0.5.0"
 gimli = { version = "0.23.0", default-features = false, features = ["read"] }
 log = "0.4.6"
-memmap = "0.7.0"
+memmap2 = "0.2.1"
 num_cpus = "1.8.0"
 target-lexicon = "0.11"
 thiserror = "1.0.15"

cranelift/filetests/src/function_runner.rs

@@ -9,7 +9,7 @@ use cranelift_codegen::{ir, settings, CodegenError, Context};
 use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};
 use cranelift_native::builder as host_isa_builder;
 use log::trace;
-use memmap::{Mmap, MmapMut};
+use memmap2::{Mmap, MmapMut};
 use std::cmp::max;
 use std::collections::HashMap;
 use thiserror::Error;