Port bytecode determinism test to static_h.

Summary:
I raised some questions about whether the compiler was deterministic.  Aakash noted that there was a test for the run-to-run determinism of at least the bytecode produced by hermesc in hermes, but that we weren't running it for static_h.

This diff ports that test over to static_h.  I changed the buck rule to be a sh_test, so we could run it as a standard test if we want.

I left the big file it uses, the Fb4a bundle, in the hermes directory.  I figure that we should only have one copy of big files; when we formally retire hermes someday, we can move those files.

allow-large-files

Reviewed By: lavenzg

Differential Revision: D66480990

fbshipit-source-id: a8eeed89a2d82205d9365d8f4d41abbd5f915418

test/determinism/test_bytecode_determinism.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# This test compiles hermes bytecode from a large js bundle several times and
+# verifies that the output is always the same.
+
+set -x -e -o pipefail
+
+exec 2>&1
+
+# hermesc binary
+HERMESC=$1
+# Path to the large js bundle.
+JS_BUNDLE=$2
+# Number of iterations that we compile from the same source and compare.
+NUM_COMP=5
+
+FIRST_HBC="$(mktemp)" || { echo "Failed to create first hbc temp file"; exit 1; }
+# Compile first bytecode.
+"$HERMESC" -O -target=HBC -emit-binary -Wno-undefined-variable -out "$FIRST_HBC" "$JS_BUNDLE" 2>/dev/null
+
+SECOND_HBC="$(mktemp)" || { echo "Failed to create second hbc temp file"; exit 1; }
+for (( i=1; i<=$((NUM_COMP)); i++ ))
+do
+    # Compile second bytecode.
+    "$HERMESC" -O -target=HBC -emit-binary -Wno-undefined-variable -out "$SECOND_HBC" "$JS_BUNDLE" 2>/dev/null
+    # Exits with non-zero status if the bytecode files differ.
+    diff "$FIRST_HBC" "$SECOND_HBC" || { echo "Bytecode diff failed with status $?."; exit 1; }
+done
+echo "Bytecode looks deterministic. Success!"