Fix Rust UB problems (#6393)

* Fix miri problems by assuming alignment is 1 in rust

* Removed is_aligned fn from rust verifier.

* Add back is_aligned, but make it w.r.t. buffer[0]

* touch unused variable

* touch unused variable

* +nightly

* Move Rust miri testing into its own docker

* fix bash

* missing one endian conversion

* fix endianness2

* format stuff

Co-authored-by: Casper Neo <cneo@google.com>

tests/RustTest.sh

@@ -50,3 +50,9 @@ else
 fi
 
 cargo bench $TARGET_FLAG
+
+# RUST_NIGHTLY environment variable set in dockerfile.
+if [[ $RUST_NIGHTLY == 1 ]]; then
+  rustup +nightly component add miri
+  cargo +nightly miri test -- -Zmiri-disable-isolation
+fi