Stop hoisting statics above cctors

Extend the logic in optLoopHoist around `CLS_VAR` nodes to ensure we don't
hoist any tree that contains a `CLS_VAR` for a field with the flag
`CORINFO_FLG_FIELD_INITCLASS` set, unless we also (identify and) hoist the
corresponding static init helper call.  The previous logic was
insufficient in that it blocked hoisting of singleton `CLS_VAR` nodes, but
not hoisting of trees that contain `CLS_VAR` nodes as sub-trees.

Add flag `GTF_FLD_INITCLASS`/`GTF_CLS_VAR_INITCLASS` so that optLoopHoist
can recall which fields are paired with static init helper calls, and only
block the hoisting of their trees.

Fixes #10780.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/jit/compiler.h b/src/jit/compiler.h
index 75cb4dc491..30c46eee30 100644
--- a/src/jit/compiler.h
+++ b/src/jit/compiler.h
@@ -5005,7 +5005,8 @@ protected:
                                   unsigned          lnum,
                                   LoopHoistContext* hoistCtxt,
                                   bool*             firstBlockAndBeforeSideEffect,
-                                  bool*             pHoistable);
+                                  bool*             pHoistable,
+                                  bool*             pCctorDependent);
 
     // Performs the hoisting 'tree' into the PreHeader for loop 'lnum'
     void optHoistCandidate(GenTreePtr tree, unsigned lnum, LoopHoistContext* hoistCtxt);