Add C-Reduce and dependencies. (#25109)

var/spack/repos/builtin/packages/creduce/package.py

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+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+from spack import *
+
+
+class Creduce(CMakePackage):
+    """C-Reduce is a tool that takes a large C, C++, or OpenCL file that has a
+    property of interest (such as triggering a compiler bug) and automatically
+    produces a much smaller C/C++ file that has the same property. It is
+    intended for use by people who discover and report bugs in compilers and
+    other tools that process source code."""
+
+    homepage = "https://embed.cs.utah.edu/creduce/"
+    url      = "https://github.com/csmith-project/creduce"
+    git      = "https://github.com/csmith-project/creduce"
+    maintainers = ['olupton']
+
+    version('develop', branch='master')
+    version('2.10.0', tag='creduce-2.10.0')
+
+    depends_on('flex')
+    depends_on('libxml2')
+    depends_on('llvm@8.0.0', when='@:2.10.999')
+    depends_on('perl')
+    depends_on('perl-exporter-lite')
+    depends_on('perl-file-which')
+    depends_on('perl-getopt-tabular')
+    depends_on('perl-regexp-common')
+    depends_on('perl-termreadkey')
+    depends_on('zlib')

var/spack/repos/builtin/packages/perl-exporter-lite/package.py

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+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PerlExporterLite(PerlPackage):
+    """Exporter::Lite is an alternative to Exporter, intended to provide a
+    lightweight subset of the most commonly-used functionality. It supports
+    import(), @EXPORT and @EXPORT_OK and not a whole lot else."""
+    homepage = "https://metacpan.org/pod/Exporter::Lite"
+    url      = "https://cpan.metacpan.org/authors/id/N/NE/NEILB/Exporter-Lite-0.08.tar.gz"
+
+    version('0.08', sha256='c05b3909af4cb86f36495e94a599d23ebab42be7a18efd0d141fc1586309dac2')

var/spack/repos/builtin/packages/perl-getopt-tabular/package.py

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+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PerlGetoptTabular(PerlPackage):
+    """Getopt::Tabular is a Perl 5 module for table-driven argument parsing,
+    vaguely inspired by John Ousterhout's Tk_ParseArgv."""
+    homepage = "https://metacpan.org/pod/Getopt::Tabular"
+    url      = "https://cpan.metacpan.org/authors/id/G/GW/GWARD/Getopt-Tabular-0.3.tar.gz"
+
+    version('0.3', sha256='9bdf067633b5913127820f4e8035edc53d08372faace56ba6bfa00c968a25377')