[rust] Add arrayvec crate

Signed-off-by: Chris Frantz <cfrantz@google.com>

third_party/rust/Cargo.lock

diff --git a/third_party/rust/Cargo.lock b/third_party/rust/Cargo.lock
index f712ea4..26dcd86 100644
--- a/third_party/rust/Cargo.lock
+++ b/third_party/rust/Cargo.lock
@@ -75,6 +75,15 @@
 ]
 
 [[package]]
+name = "arrayvec"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
+dependencies = [
+ "serde",
+]
+
+[[package]]
 name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -166,6 +175,7 @@
 dependencies = [
  "ansi_term",
  "anyhow",
+ "arrayvec",
  "atty",
  "bitflags",
  "bitvec",

third_party/rust/Cargo.toml

diff --git a/third_party/rust/Cargo.toml b/third_party/rust/Cargo.toml
index e23d2fb..a397398 100644
--- a/third_party/rust/Cargo.toml
+++ b/third_party/rust/Cargo.toml
@@ -14,6 +14,7 @@
 # Please avoid version numbers that only have one component.
 [dependencies]
 anyhow = { version = "1.0.57", features=["backtrace"] }
+arrayvec = { version = "0.7", features=["serde"] }
 atty = "0.2"
 bitflags = "1.0"
 bitvec = "1.0.1"

third_party/rust/crates/BUILD.arrayvec-0.7.2.bazel

diff --git a/third_party/rust/crates/BUILD.arrayvec-0.7.2.bazel b/third_party/rust/crates/BUILD.arrayvec-0.7.2.bazel
new file mode 100644
index 0000000..7686cf0
--- /dev/null
+++ b/third_party/rust/crates/BUILD.arrayvec-0.7.2.bazel
@@ -0,0 +1,49 @@
+###############################################################################
+# @generated
+# DO NOT MODIFY: This file is auto-generated by a crate_universe tool. To
+# regenerate this file, run the following:
+#
+#     bazel run //third_party/rust:crate_index
+###############################################################################
+
+load("@rules_rust//rust:defs.bzl", "rust_library")
+
+package(default_visibility = ["//visibility:public"])
+
+# licenses([
+#     "TODO",  # MIT OR Apache-2.0
+# ])
+
+rust_library(
+    name = "arrayvec",
+    srcs = glob(["**/*.rs"]),
+    compile_data = glob(
+        include = ["**"],
+        exclude = [
+            "**/* *",
+            "BUILD",
+            "BUILD.bazel",
+            "WORKSPACE",
+            "WORKSPACE.bazel",
+        ],
+    ),
+    crate_features = [
+        "default",
+        "serde",
+        "std",
+    ],
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = ["--cap-lints=allow"],
+    tags = [
+        "cargo-bazel",
+        "crate-name=arrayvec",
+        "manual",
+        "noclippy",
+        "norustfmt",
+    ],
+    version = "0.7.2",
+    deps = [
+        "@crate_index__serde-1.0.152//:serde",
+    ],
+)

third_party/rust/crates/BUILD.bazel

diff --git a/third_party/rust/crates/BUILD.bazel b/third_party/rust/crates/BUILD.bazel
index edd974e..00d9c30 100644
--- a/third_party/rust/crates/BUILD.bazel
+++ b/third_party/rust/crates/BUILD.bazel
@@ -38,6 +38,12 @@
 )
 
 alias(
+    name = "arrayvec",
+    actual = "@crate_index__arrayvec-0.7.2//:arrayvec",
+    tags = ["manual"],
+)
+
+alias(
     name = "atty",
     actual = "@crate_index__atty-0.2.14//:atty",
     tags = ["manual"],

third_party/rust/crates/defs.bzl

diff --git a/third_party/rust/crates/defs.bzl b/third_party/rust/crates/defs.bzl
index 9416d1b..87101ce 100644
--- a/third_party/rust/crates/defs.bzl
+++ b/third_party/rust/crates/defs.bzl
@@ -293,6 +293,7 @@
         _COMMON_CONDITION: {
             "ansi_term": "@crate_index__ansi_term-0.12.1//:ansi_term",
             "anyhow": "@crate_index__anyhow-1.0.69//:anyhow",
+            "arrayvec": "@crate_index__arrayvec-0.7.2//:arrayvec",
             "atty": "@crate_index__atty-0.2.14//:atty",
             "bitflags": "@crate_index__bitflags-1.3.2//:bitflags",
             "bitvec": "@crate_index__bitvec-1.0.1//:bitvec",
@@ -530,6 +531,16 @@
 
     maybe(
         http_archive,
+        name = "crate_index__arrayvec-0.7.2",
+        sha256 = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6",
+        type = "tar.gz",
+        urls = ["https://crates.io/api/v1/crates/arrayvec/0.7.2/download"],
+        strip_prefix = "arrayvec-0.7.2",
+        build_file = Label("@lowrisc_opentitan//third_party/rust/crates:BUILD.arrayvec-0.7.2.bazel"),
+    )
+
+    maybe(
+        http_archive,
         name = "crate_index__atty-0.2.14",
         sha256 = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8",
         type = "tar.gz",