Hooking up asm-wasm conversion.

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index c3c2b84be817acd7a6645128cd1226e8abb57158..019e703f9865454753ce7aa91b8c023f7f02a623 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -1413,6 +1413,42 @@ void Builtins::Generate_CompileOptimizedConcurrent(MacroAssembler* masm) {
   GenerateTailCallToReturnedCode(masm, Runtime::kCompileOptimized_Concurrent);
 }
 
+void Builtins::Generate_InstantiateAsmJs(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- r3 : argument count (preserved for callee)
+  //  -- r4 : new target (preserved for callee)
+  //  -- r6 : target function (preserved for callee)
+  // -----------------------------------
+  Label failed;
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    // Push a copy of the target function and the new target.
+    // Push function as parameter to the runtime call.
+    __ SmiTag(r3);
+    __ Push(r3, r4, r6, r4);
+
+    // Copy arguments from caller (stdlib, foreign, heap).
+    for (int i = 2; i >= 0; --i) {
+      __ LoadP(r4, MemOperand(fp, StandardFrameConstants::kCallerSPOffset +
+                                      i * kPointerSize));
+      __ push(r4);
+    }
+    // Call runtime, on success unwind frame, and parent frame.
+    __ CallRuntime(Runtime::kInstantiateAsmJs, 4);
+    // A smi 0 is returned on failure, an object on success.
+    __ JumpIfSmi(r3, &failed);
+    scope.GenerateLeaveFrame();
+    __ Drop(4);
+    __ Ret();
+
+    __ bind(&failed);
+    // Restore target function and new target.
+    __ Pop(r3, r4, r6);
+    __ SmiUntag(r3);
+  }
+  // On failure, tail call into generated baseline code.
+  GenerateTailCallToReturnedCode(masm, Runtime::kCompileBaseline);
+}
 
 static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
   // For now, we are relying on the fact that make_code_young doesn't do any