Move ObjectAllocator phase to run right after inlining. (#20377)

This change will support object stack allocation for the following reasons:

1. Objects should be allocated on the stack before struct promotion phase
so that their fields have a chance to be promoted.
2. Eventually object stack allocation will be performed in the same phase
as inlining since inlining heuristics will need to be aware of object stack allocation
opportunities.

I verified no x64 diffs with jit-diffs --frameworks --tests --pmi

1 files changed, 9 insertions, 4 deletions

diff --git a/src/jit/phase.h b/src/jit/phase.h
index d8e2940089..2077f94dd8 100644
--- a/src/jit/phase.h
+++ b/src/jit/phase.h
@@ -12,7 +12,8 @@ public:
     virtual void Run();
 
 protected:
-    Phase(Compiler* _comp, const char* _name, Phases _phase = PHASE_NUMBER_OF) : comp(_comp), name(_name), phase(_phase)
+    Phase(Compiler* _comp, const char* _name, Phases _phase = PHASE_NUMBER_OF)
+        : comp(_comp), name(_name), phase(_phase), doChecks(true)
     {
     }
 
@@ -23,6 +24,7 @@ protected:
     Compiler*   comp;
     const char* name;
     Phases      phase;
+    bool        doChecks;
 };
 
 inline void Phase::Run()
@@ -42,7 +44,7 @@ inline void Phase::PrePhase()
         comp->fgDispBasicBlocks(true);
     }
 
-    if (comp->expensiveDebugCheckLevel >= 2)
+    if (doChecks && comp->expensiveDebugCheckLevel >= 2)
     {
         // If everyone used the Phase class, this would duplicate the PostPhase() from the previous phase.
         // But, not everyone does, so go ahead and do the check here, too.
@@ -69,8 +71,11 @@ inline void Phase::PostPhase()
     }
 
 #ifdef DEBUG
-    comp->fgDebugCheckBBlist();
-    comp->fgDebugCheckLinks();
+    if (doChecks)
+    {
+        comp->fgDebugCheckBBlist();
+        comp->fgDebugCheckLinks();
+    }
 #endif // DEBUG
 }