[Bug c/84422] New: ICE on various builtin test functions when compiled with -mcpu=power7

["carll at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84422

            Bug ID: 84422
           Summary: ICE on various builtin test functions when compiled
                    with -mcpu=power7
           Product: gcc
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: carll at gcc dot gnu.org
  Target Milestone: ---

On Power 8 LE the following builtin test function produce an internal compiler
error when compiled with the command:

     gcc -c -m64 -mcpu=power7 <file name>

gcc/testsuite/gcc.target/powerpc/builtins-3-runnable.c
   during RTL pass: vregs

gcc/testsuite/gcc.target/powerpc/fold-vec-neg-longlong.p8.c
    during RTL pass: vregs

gcc/testsuite/gcc.target/powerpc/fold-vec-neg-longlong.p9.c
    during RTL pass: vregs

gcc/testsuite/gcc.target/powerpc/sse2-pmuludq-1.c
    during RTL pass: expand

For completeness, the following also fails and has an existing PR for it.

gcc/testsuite/gcc.target/powerpc/builtin-fctid-fctiw-runnable.c
  during RTL pass: reload
  Note, existing PR 83964,