[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..31d01aa1669a88ffa8180dc5f419408dcda0073a 100644
--- a/test/cctest/asmjs/test-asm-typer.cc
+++ b/test/cctest/asmjs/test-asm-typer.cc
@@ -505,10 +505,10 @@ 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"},

[bradnelson, 2016/10/19 21:52:07]

Add tests that hit:
Undeclared identifier in return statement
Identifier in return statement is not const
Undeclared identifier in variable declaration initializer
Identifier in variable declaration initializer must be const

Add something that covers (since that changed and we didn't catch:
Invalid variable initialization - it should be a literal, const, or
fround(literal).

[John, 2016/10/20 15:13:22]

Done.

       {"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)"},