rename get_global_alloc to try_get_global_alloc

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -369,7 +369,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
                 // we don't deallocate it.
                 let (alloc_id, _, _) = ecx.ptr_get_alloc_id(ptr)?;
                 let is_allocated_in_another_const = matches!(
-                    ecx.tcx.get_global_alloc(alloc_id),
+                    ecx.tcx.try_get_global_alloc(alloc_id),
                     Some(interpret::GlobalAlloc::Memory(_))
                 );
 

compiler/rustc_const_eval/src/const_eval/mod.rs

@@ -138,7 +138,7 @@ pub(crate) fn deref_mir_constant<'tcx>(
     let mplace = ecx.deref_operand(&op).unwrap();
     if let Some(alloc_id) = mplace.ptr.provenance {
         assert_eq!(
-            tcx.get_global_alloc(alloc_id).unwrap().unwrap_memory().0.0.mutability,
+            tcx.global_alloc(alloc_id).unwrap_memory().0.0.mutability,
             Mutability::Not,
             "deref_mir_constant cannot be used with mutable allocations as \
             that could allow pattern matching to observe mutable statics",