ibm-java: fix the URL to only use a machine type that ibm-java
supports so that 'spack info' doesn't report a non-existent URL on
platforms that it doesn't support.
Change 'destination' to 'placement' in the use of resource() for
intel-xed and hpcviewer. Recent commits (1842873f and eb584d89)
changed the directory path for a resource and thus broke the build
for these packages.
* hpcviewer: new package
Add binary package for hpcviewer and hpctraceviewer for the Rice
hpctoolkit on Linux x86_64, ppc64 and ppc64le.
* ibm-java: add property 'home' so that spec['java'].home will work.
* Flake
* More flake.
* Test that the version, machine type pair exists before using it in the
sha dictionaries so that 'spack info' doesn't crash on unsupported
configurations.
