Add missing resets for function translation allocations (#1034)

* add missing reset for some translation allocations

* add missing docs

crates/wasmi/src/engine/bytecode/provider.rs

@@ -92,6 +92,12 @@ impl<T> Default for ProviderSliceStack<T> {
 }
 
 impl<T> ProviderSliceStack<T> {
+    /// Resets the [`ProviderSliceStack`] to allow for reuse.
+    pub fn reset(&mut self) {
+        self.ends.clear();
+        self.providers.clear();
+    }
+
     /// Pushes a new [`Provider`] slice and returns its [`ProviderSliceRef`].
     pub fn push<I>(&mut self, providers: I) -> Result<ProviderSliceRef, Error>
     where

crates/wasmi/src/engine/translator/control_stack.rs

@@ -44,7 +44,8 @@ pub struct ControlStack {
 impl ControlStack {
     /// Resets the [`ControlStack`] to allow for reuse.
     pub fn reset(&mut self) {
-        self.frames.clear()
+        self.frames.clear();
+        self.else_providers.reset();
     }
 
     /// Returns `true` if `relative_depth` points to the first control flow frame.

crates/wasmi/src/engine/translator/mod.rs

@@ -112,6 +112,7 @@ impl PreservedLocal {
 }
 
 impl TranslationBuffers {
+    /// Resets the [`TranslationBuffers`].
     fn reset(&mut self) {
         self.providers.clear();
         self.br_table_targets.clear();

crates/wasmi/src/engine/translator/stack/register_alloc.rs

@@ -141,6 +141,7 @@ impl RegisterAlloc {
         self.next_dynamic = 0;
         self.max_dynamic = 0;
         self.min_preserve = Self::INITIAL_PRESERVATION_INDEX;
+        self.defrag_offset = 0;
     }
 
     /// Adjusts the [`RegisterAlloc`] for the popped [`TaggedProvider`] and returns a [`TypedProvider`].