[pushed] analyzer: prevent ICEs with null types

[David Malcolm]

Fixes some ICEs seen analyzing the Linux kernel.

Successfully bootstrapped & regrtested on x86_64-pc-linux-gnu.
Pushed to trunk as r14-9762-ge945d322fcbc68.

gcc/analyzer/ChangeLog:
        * region-model-manager.cc (maybe_undo_optimize_bit_field_compare):
        Guard against null types.
        * region-model.cc (apply_constraints_for_gswitch): Likewise.

Signed-off-by: David Malcolm <dmalc...@redhat.com>
---
 gcc/analyzer/region-model-manager.cc | 2 ++
 gcc/analyzer/region-model.cc         | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/analyzer/region-model-manager.cc 
b/gcc/analyzer/region-model-manager.cc
index 4feb349c9142..f155eeb87c0d 100644
--- a/gcc/analyzer/region-model-manager.cc
+++ b/gcc/analyzer/region-model-manager.cc
@@ -616,6 +616,8 @@ maybe_undo_optimize_bit_field_compare (tree type,
                                       tree cst,
                                       const svalue *arg1)
 {
+  if (!type)
+    return nullptr;
   if (!INTEGRAL_TYPE_P (type))
     return NULL;
 
diff --git a/gcc/analyzer/region-model.cc b/gcc/analyzer/region-model.cc
index 902b887fc074..98f287145c6c 100644
--- a/gcc/analyzer/region-model.cc
+++ b/gcc/analyzer/region-model.cc
@@ -5781,7 +5781,8 @@ apply_constraints_for_gswitch (const switch_cfg_superedge 
&edge,
          && is_a <const initial_svalue *> (unaryop->get_arg ()))
        if (const initial_svalue *initvalop = (as_a <const initial_svalue *>
                                               (unaryop->get_arg ())))
-         if (TREE_CODE (initvalop->get_type ()) == ENUMERAL_TYPE)
+         if (initvalop->get_type ()
+             && TREE_CODE (initvalop->get_type ()) == ENUMERAL_TYPE)
            {
              index_sval = initvalop;
              check_index_type = false;
-- 
2.26.3