[V8][asm.js] Adds support to global const variables.

test/cctest/asmjs/test-asm-typer.cc

Index: test/cctest/asmjs/test-asm-typer.cc
diff --git a/test/cctest/asmjs/test-asm-typer.cc b/test/cctest/asmjs/test-asm-typer.cc
index 828a0cd12e3a2b7dd3bfcc28b6a7c5aeaf243779..290bd6c814f4a7b25919fbee48d6d62f7dc5f4e5 100644
--- a/test/cctest/asmjs/test-asm-typer.cc
+++ b/test/cctest/asmjs/test-asm-typer.cc
@@ -505,14 +505,15 @@ TEST(ErrorsInGlobalVariableDefinition) {
     const char* error_message;
   } kTests[] = {
       {"var v;", "Global variable missing initializer"},
-      {"var v = uninitialized;", "Invalid global variable initializer"},
+      {"var v = uninitialized;", "Undeclared identifier in global"},
       {"var v = 'use asm';", "type annotation - forbidden literal"},
       {"var v = 4294967296;", " - forbidden literal"},
-      {"var v = not_fround;", "Invalid global variable initializer"},
+      {"var v = not_fround;", "initialize a global must be a const"},
       {"var v = not_fround(1);", "expected call fround(literal)"},
       {"var v = __fround__(1.0);", "expected call fround(literal)"},
       {"var v = fround(1.0, 1.0);", "expected call fround(literal)"},
       {"var v = fround(not_fround);", "literal argument for call to fround"},
+      {"var v = i?0:1;", "Invalid global variable initializer"},
       {"var v = stdlib.nan", "Invalid import"},
       {"var v = stdlib.Math.nan", "Invalid import"},
       {"var v = stdlib.Mathh.E", "Invalid import"},
@@ -788,6 +789,19 @@ TEST(ErrorsInFunction) {
        "  var c = 0;\n"
        "}\n",
        "Local variable missing initializer in asm.js module"},
+      {"function f(a) {\n"
+       "  a = a|0;\n"
+       "  var x = a;\n"
+       "}\n",
+       "variable declaration initializer must be const"},
+      {"function f() {\n"
+       "  var x = 1+i;\n"
+       "}\n",
+       "should be a literal, const, or fround(literal"},
+      {"function f() {\n"
+       "  var x = a;\n"
+       "}\n",
+       "Undeclared identifier in variable declaration initializer"},
       {"function f() {\n"
        "  function ff() {}\n"
        "}\n",
@@ -812,6 +826,19 @@ TEST(ErrorsInFunction) {
        " return 2147483648;\n"
        "}\n",
        "Invalid literal in return statement"},
+      {"function f(a) {\n"
+       "  a = a|0;\n"
+       "  return a;\n"
+       "}\n",
+       "in return statement is not const"},
+      {"function f() {\n"
+       "  return a;\n"
+       "}\n",
+       "Undeclared identifier in return statement"},
+      {"function f() {\n"
+       "  return i?0:1;\n"
+       "}\n",
+       "Invalid return type expression"},
       {"function f() {\n"
        "  return stdlib.Math.E;"
        "}\n",