[wasm] asm.js: Work around parser converting !0 and !1 to boolean.

src/asmjs/asm-typer.cc

Index: src/asmjs/asm-typer.cc
diff --git a/src/asmjs/asm-typer.cc b/src/asmjs/asm-typer.cc
index a98c18b5328d4ae12dc5746130b9a56afeffdfa2..76cdf25456dcdbc578459a9e929ee8e884fa50d3 100644
--- a/src/asmjs/asm-typer.cc
+++ b/src/asmjs/asm-typer.cc
@@ -1664,6 +1664,12 @@ AsmType* AsmTyper::ValidateNumericLiteral(Literal* literal) {
     return AsmType::Double();
   }
 
+  // The parser collapses expressions like !0 and !123 to true/false.
+  // We therefore need to permit these as alternate versions of 0 / 1.
+  if (literal->raw_value()->IsTrue() || literal->raw_value()->IsFalse()) {
+    return AsmType::Int();
+  }
+
   uint32_t value;
   if (!literal->value()->ToUint32(&value)) {
     int32_t value;