RawVecInner: add missing unsafe to unsafe fns

Author: btj

library/alloc/src/raw_vec/mod.rs

@@ -573,7 +573,7 @@ impl<A: Allocator> RawVecInner<A> {
         }
     }
 
-    fn try_reserve(
+    unsafe fn try_reserve(
         &mut self,
         len: usize,
         additional: usize,
@@ -597,7 +597,7 @@ impl<A: Allocator> RawVecInner<A> {
         }
     }
 
-    fn try_reserve_exact(
+    unsafe fn try_reserve_exact(
         &mut self,
         len: usize,
         additional: usize,
@@ -636,7 +636,7 @@ impl<A: Allocator> RawVecInner<A> {
         self.cap = unsafe { Cap::new_unchecked(cap) };
     }
 
-    fn grow_amortized(
+    unsafe fn grow_amortized(
         &mut self,
         len: usize,
         additional: usize,
@@ -668,7 +668,7 @@ impl<A: Allocator> RawVecInner<A> {
         Ok(())
     }
 
-    fn grow_exact(
+    unsafe fn grow_exact(
         &mut self,
         len: usize,
         additional: usize,