Fix conversion to float32, typing issue, split apart asm-wasm tests.

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index c4bde203fa71de431a8f4c0d7382348b3928504e..c47f5495e4646852d68a7bfa9d9859a393d2cb93 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -1605,11 +1605,13 @@ Node* WasmGraphBuilder::BuildCFuncInstruction(ExternalReference ref,
 }
 
 Node* WasmGraphBuilder::BuildF32SConvertI64(Node* input) {
+  // TODO(titzer/bradnelson): Check handlng of asm.js case.
   return BuildIntToFloatConversionInstruction(
       input, ExternalReference::wasm_int64_to_float32(jsgraph()->isolate()),
       MachineRepresentation::kWord64, MachineType::Float32());
 }
 Node* WasmGraphBuilder::BuildF32UConvertI64(Node* input) {
+  // TODO(titzer/bradnelson): Check handlng of asm.js case.
   return BuildIntToFloatConversionInstruction(
       input, ExternalReference::wasm_uint64_to_float32(jsgraph()->isolate()),
       MachineRepresentation::kWord64, MachineType::Float32());