[wasm] Provide backoff implementations for the Fxx rounding instructions

src/compiler/wasm-compiler.h

Index: src/compiler/wasm-compiler.h
diff --git a/src/compiler/wasm-compiler.h b/src/compiler/wasm-compiler.h
index f366a40e6d67640ff7d901a81facff4fca7e83f4..6742d06a75a0383eaea36c880f5c320dd057e9f7 100644
--- a/src/compiler/wasm-compiler.h
+++ b/src/compiler/wasm-compiler.h
@@ -177,8 +177,16 @@ class WasmGraphBuilder {
   Node* BuildI32Popcnt(Node* input);
   Node* BuildI64Ctz(Node* input);
   Node* BuildI64Popcnt(Node* input);
+  Node* BuildRoundingInstruction(Node* input, ExternalReference ref,
+                                 MachineType type);
   Node* BuildF32Trunc(Node* input);
+  Node* BuildF32Floor(Node* input);
+  Node* BuildF32Ceil(Node* input);
+  Node* BuildF32NearestInt(Node* input);
   Node* BuildF64Trunc(Node* input);
+  Node* BuildF64Floor(Node* input);
+  Node* BuildF64Ceil(Node* input);
+  Node* BuildF64NearestInt(Node* input);
 
   Node** Realloc(Node** buffer, size_t count) {
     Node** buf = Buffer(count);