Replace multi-loaderallocator hash implementation in MethodDescBackpatchInfo (#22285)

* GCHeapHash
- Hashtable implementation for runtime use
- Implementation written in C++
- Data storage in managed heap memory
- Based on SHash design, but using managed memory

CrossLoaderAllocatorHash
- Hash for c++ Pointer to C++ pointer where the lifetimes are controlled by different loader allocators
 - Support for add/remove/visit all entries of 1 key/visit all entries/ remove all entries of 1 key
- Supports holding data which is unmanaged, but data items themselves can be of any size (key/value are templated types)

* Swap MethodDescBackpatchInfo to use the CrossLoaderAllocatorHash

* The MethodDescBackpatchCrst needs to be around an allocation
- Adjust the Crst so that it can safely be used around code which allocates
- Required moving its use out from within the EESuspend logic used in rejit

1 files changed, 2 insertions, 0 deletions

diff --git a/src/vm/prestub.cpp b/src/vm/prestub.cpp
index d04a5d0a54..a08a2d1a10 100644
--- a/src/vm/prestub.cpp
+++ b/src/vm/prestub.cpp
@@ -1964,6 +1964,8 @@ PCODE MethodDesc::DoPrestub(MethodTable *pDispatchingMT)
             return pCode;
         }
 
+        _ASSERTE(!MayHaveEntryPointSlotsToBackpatch()); // This path doesn't lock the MethodDescBackpatchTracker as it should only
+                                                        // happen for jump-stampable or non-versionable methods
         SetCodeEntryPoint(pCode);
     }
     else