Add very basic test framework for parser tests.

Start with a shell script that runs .cton files through 'cton-util cat' and
compares the output to a reference. This can get fancy later.

tests/parser/README.rst

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+Parser tests
+============
+
+This directory contains test cases for the Cretonne IL parser.
+
+Each test case consists of a `foo.cton` input file and a `foo.ref` reference
+output file. Each input file is run through the `cton-util cat` command, and the
+output is compared against the reference file. If the two are identical, the
+test passes.

tests/parser/run.sh

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+#!/bin/bash
+
+# Go to tests directory.
+cd $(dirname "$0")/..
+
+# The path to cton-util should be in $CTONUTIL.
+if [ -z "$CTONUTIL" ]; then
+    CTONUTIL=../src/tools/target/debug/cton-util
+fi
+
+if [ ! -x "$CTONUTIL" ]; then
+    echo "Can't fund executable cton-util: $CTONUTIL" 1>&2
+    exit 1
+fi
+
+declare -a fails
+
+for testcase in $(find parser -name '*.cton'); do
+    ref="${testcase}.ref"
+    if [ ! -r "$ref" ]; then
+        fails=(${fails[@]} "$testcase")
+        echo MISSING: $ref
+    elif diff -u "$ref" <("$CTONUTIL" cat "$testcase"); then
+        echo OK $testcase
+    else
+        fails=(${fails[@]} "$testcase")
+        echo FAIL $testcase
+    fi
+done
+
+if [ ${#fails[@]} -ne 0 ]; then
+    echo
+    echo Failures:
+    for f in "${fails[@]}"; do
+        echo "  $f"
+    done
+    exit 1
+else
+    echo "All passed"
+fi

tests/parser/tiny.cton

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+; The smallest possible function.
+function minimal() {
+ebb0:
+    trap
+}

tests/parser/tiny.cton.ref

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+function minimal() {
+ebb0:
+    trap
+}