new package: qcachegrind@20.08.0 (#18295)

Co-authored-by: Andrew Elble <aweits@localhost.localdomain>

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

+# Copyright 2013-2020 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)
+
+
+class Qcachegrind(QMakePackage):
+    """{K,Q}Cachegrind is a KDE/Qt GUI to visualize profiling data.
+    It's mainly used as visualization frontend for data measured
+    by Cachegrind/Callgrind tools from the Valgrind package, but
+    there are converters for other measurement tools available.
+    Also provides the command-line tool 'cgview'"""
+
+    homepage = "https://github.com/KDE/kcachegrind"
+    url = "https://github.com/KDE/kcachegrind/archive/v20.08.0.tar.gz"
+
+    version('20.08.0', sha256='ffb50a7c536042ff11eed714b359b8bc419cb12402a31ebe78c3d06363f234e6')
+
+    depends_on('qt@5.2:')
+    depends_on('graphviz', type='run')
+
+    def install(self, spec, prefix):
+        mkdir(prefix.bin)
+        install('cgview/cgview', prefix.bin)
+        install('qcachegrind/qcachegrind', prefix.bin)