[wasm] Fix double to int conversions.

R=ahaas@chromium.org
LOG=Y
BUG=chromium:576560

Review URL: https://codereview.chromium.org/1574063005

Cr-Commit-Position: refs/heads/master@{#33239}

src/wasm/asm-wasm-builder.cc

@@ -622,9 +622,7 @@ class AsmWasmBuilderImpl : public AstVisitor {
 
   ConvertOperation MatchOr(BinaryOperation* expr) {
     if (MatchIntBinaryOperation(expr, Token::BIT_OR, 0)) {
-      DCHECK(TypeOf(expr->left()) == kAstI32);
-      DCHECK(TypeOf(expr->right()) == kAstI32);
-      return kAsIs;
+      return (TypeOf(expr->left()) == kAstI32) ? kAsIs : kToInt;
     } else {
       return kNone;
     }
@@ -632,9 +630,8 @@ class AsmWasmBuilderImpl : public AstVisitor {
 
   ConvertOperation MatchShr(BinaryOperation* expr) {
     if (MatchIntBinaryOperation(expr, Token::SHR, 0)) {
-      DCHECK(TypeOf(expr->left()) == kAstI32);
-      DCHECK(TypeOf(expr->right()) == kAstI32);
-      return kAsIs;
+      // TODO(titzer): this probably needs to be kToUint
+      return (TypeOf(expr->left()) == kAstI32) ? kAsIs : kToInt;
     } else {
       return kNone;
     }

test/mjsunit/wasm/asm-wasm.js

@@ -23,6 +23,8 @@ function IntTest() {
     a = a|0;
     b = b|0;
     var c = (b + 1)|0
+    var d = 3.0;
+    var e = d | 0;  // double conversion
     return (a + c + 1)|0;
   }