Refactor Utilcode's IAllocators.

- `DefaultAllocator` has been replaced with `HostAllocator` in RyuJIT, which
  uses the JIT hosting interface to allocate and free memory.
- The definition of `DefaultAllocator` has been moved into its own file, as it
  remains in use by the interpreter and the binder.
- `ProcessHeapAllocator` has been moved into JIT32, as that was its only
  remaining user.
- `AllowZeroAllocator`'s static field has been changed to an instance field
  to avoid the need to define storage for the static field in Utilcode.

[tfs-changeset: 1581242]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/inc/simplerhash.inl b/src/inc/simplerhash.inl
index 1a7d004b26..091f047311 100644
--- a/src/inc/simplerhash.inl
+++ b/src/inc/simplerhash.inl
@@ -51,7 +51,7 @@ SimplerHashTable<Key,KeyFuncs,Value,Behavior>::SimplerHashTable(IAllocator* allo
 {
     LIMITED_METHOD_CONTRACT;
 
-    if (m_alloc == NULL) m_alloc = DefaultAllocator::Singleton();
+    assert(m_alloc != nullptr);
 
 #ifndef __GNUC__ // these crash GCC
     static_assert_no_msg(Behavior::s_growth_factor_numerator > Behavior::s_growth_factor_denominator);