[wasm] WasmRunner can run tests with I64 parameters and return value.

src/compiler/ppc/code-generator-ppc.cc

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index e639a9247fa3f54856ddcd1fae81d7f5b579383a..507dc7f3ff6b3153190baa55a06bef7a04bd5f7f 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -1579,7 +1579,7 @@ void CodeGenerator::AssembleDeoptimizerCall(
 
 
 void CodeGenerator::AssemblePrologue() {
-  CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
+  const CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
   if (descriptor->IsCFunctionCall()) {
     __ function_descriptor();
     __ mflr(r0);
@@ -1653,7 +1653,7 @@ void CodeGenerator::AssemblePrologue() {
 
 
 void CodeGenerator::AssembleReturn() {
-  CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
+  const CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
   int pop_count = static_cast<int>(descriptor->StackParameterCount());
 
   // Restore registers.