Fix ICE in profile_count::to_sreal_frequency

[Jan Hubicka via Gcc-patches]

As discussed in the PR log, profile_count::to_cgraph_frequency was originally
intended to work across function boundary and has some extra logic and sanity
check for that.  It is used only within single function and with current
API it can not really work well globally, so this patch synchronizes its
implementation with probability_in which does similar job but to determine
relative probability.

Bootstrpped/regtested x86_64-linux, and also profilebootstrapped. Comitted.

gcc/ChangeLog:

2023-03-14  Jan Hubicka  <hubi...@ucw.cz>

        PR tree-optimization/106896
        * profile-count.cc (profile_count::to_sreal_scale): Synchronize
        implementatoin with probability_in; avoid some asserts.

diff --git a/gcc/profile-count.cc b/gcc/profile-count.cc
index d05fef3fb00..16585045f8e 100644
--- a/gcc/profile-count.cc
+++ b/gcc/profile-count.cc
@@ -325,6 +325,13 @@ profile_count::to_cgraph_frequency (profile_count 
entry_bb_count) const
 sreal
 profile_count::to_sreal_scale (profile_count in, bool *known) const
 {
+  if (*this == zero ()
+      && !(in == zero ()))
+  {
+    if (known)
+      *known = true;
+    return 0;
+  }
   if (!initialized_p () || !in.initialized_p ())
     {
       if (known)
@@ -333,32 +340,13 @@ profile_count::to_sreal_scale (profile_count in, bool 
*known) const
     }
   if (known)
     *known = true;
-  /* Watch for cases where one count is IPA and other is not.  */
-  if (in.ipa ().initialized_p ())
-    {
-      gcc_checking_assert (ipa ().initialized_p ());
-      /* If current count is inter-procedurally 0 and IN is inter-procedurally
-        non-zero, return 0.  */
-      if (in.ipa ().nonzero_p ()
-         && !ipa().nonzero_p ())
-       return 0;
-    }
-  else 
-    /* We can handle correctly 0 IPA count within locally estimated
-       profile, but otherwise we are lost and this should not happen.   */
-    gcc_checking_assert (!ipa ().initialized_p () || !ipa ().nonzero_p ());
-  if (*this == zero ())
-    return 0;
-  if (m_val == in.m_val)
+  if (*this == in)
     return 1;
   gcc_checking_assert (compatible_p (in));
-
+  if (m_val == in.m_val)
+    return 1;
   if (!in.m_val)
-    {
-      if (!m_val)
-       return 1;
-      return m_val * 4;
-    }
+    return m_val * 4;
   return (sreal)m_val / (sreal)in.m_val;
 }