[wasm] [asm.js] Fix asm.js issues around floating point globals.

src/asmjs/asm-wasm-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 // Required to get M_E etc. in MSVC.
 #if defined(_WIN32)
 #define _USE_MATH_DEFINES
 #endif
@@ skipping 1321 matching lines @@
     }
   }
 
   void VisitCall(Call* expr) { VisitCallExpression(expr); }
 
   bool VisitCallExpression(Call* expr) {
     Call::CallType call_type = expr->GetCallType();
     bool returns_value = true;
     switch (call_type) {
       case Call::OTHER_CALL: {
-        DCHECK_EQ(kFuncScope, scope_);
         VariableProxy* proxy = expr->expression()->AsVariableProxy();
         if (proxy != nullptr) {
+          DCHECK(kFuncScope == scope_ ||
+                 typer_->VariableAsStandardMember(proxy->var()) ==
+                     AsmTyper::kMathFround);
           if (VisitStdlibFunction(expr, proxy)) {
             return true;
           }
         }
+        DCHECK(kFuncScope == scope_);
         VariableProxy* vp = expr->expression()->AsVariableProxy();
         DCHECK_NOT_NULL(vp);
         if (typer_->TypeOf(vp)->AsFFIType() != nullptr) {
           LocalType return_type = TypeOf(expr);
           ZoneList<Expression*>* args = expr->arguments();
           FunctionSig::Builder sig(zone(), return_type == kAstStmt ? 0 : 1,
                                    args->length());
           if (return_type != kAstStmt) {
             sig.AddReturn(return_type);
           } else {
@@ skipping 524 matching lines @@
   impl.builder_->WriteTo(*buffer);
   return buffer;
 }
 
 const char* AsmWasmBuilder::foreign_init_name = "__foreign_init__";
 const char* AsmWasmBuilder::single_function_name = "__single_function__";
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8