[wasm] Introduce custom asm.js bytecodes for double->int conversions.

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 583b3a864906047d9e0c87bab953941b05ff22f4..c3e599429995b71e4dd22dd05709940a98c931da 100644
--- a/src/compiler/wasm-compiler.h
+++ b/src/compiler/wasm-compiler.h
@@ -267,11 +267,6 @@ class WasmGraphBuilder {
   Node* BuildI32DivU(Node* left, Node* right, wasm::WasmCodePosition position);
   Node* BuildI32RemU(Node* left, Node* right, wasm::WasmCodePosition position);
 
-  Node* BuildI32AsmjsDivS(Node* left, Node* right);
-  Node* BuildI32AsmjsRemS(Node* left, Node* right);
-  Node* BuildI32AsmjsDivU(Node* left, Node* right);
-  Node* BuildI32AsmjsRemU(Node* left, Node* right);
-
   Node* BuildI64DivS(Node* left, Node* right, wasm::WasmCodePosition position);
   Node* BuildI64RemS(Node* left, Node* right, wasm::WasmCodePosition position);
   Node* BuildI64DivU(Node* left, Node* right, wasm::WasmCodePosition position);
@@ -296,6 +291,16 @@ class WasmGraphBuilder {
   Node* BuildLoadHeapNumberValue(Node* value, Node* control);
   Node* BuildHeapNumberValueIndexConstant();
 
+  // Asm.js specific functionality.
+  Node* BuildI32AsmjsSConvertF32(Node* input);
+  Node* BuildI32AsmjsSConvertF64(Node* input);
+  Node* BuildI32AsmjsUConvertF32(Node* input);
+  Node* BuildI32AsmjsUConvertF64(Node* input);
+  Node* BuildI32AsmjsDivS(Node* left, Node* right);
+  Node* BuildI32AsmjsRemS(Node* left, Node* right);
+  Node* BuildI32AsmjsDivU(Node* left, Node* right);
+  Node* BuildI32AsmjsRemU(Node* left, Node* right);
+
   Node** Realloc(Node** buffer, size_t old_count, size_t new_count) {
     Node** buf = Buffer(new_count);
     if (buf != buffer) memcpy(buf, buffer, old_count * sizeof(Node*));