Bugfix: Install missing compilers for dependency packages (#11175)
Bugfix: Install missing compilers for dependency packages (#11175)

Compilers are treated separately from other dependencies in Spack.
#10761 added the option to automatically install compilers when a
package specifies using a compiler that is not available in Spack.
However, this did not work correctly for dependency packages (it
would only build a compiler for the root of an install DAG). This
commit enables the building of compilers for dependency packages.
LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack