Don't throw during a disallow-heap-allocation scope

Exception throwing will allocate

R=bmeurer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2173423002
Cr-Commit-Position: refs/heads/master@{#37997}

src/runtime/runtime-i18n.cc

@@ -569,6 +569,10 @@ RUNTIME_FUNCTION(Runtime_InternalCompare) {
 
   string1 = String::Flatten(string1);
   string2 = String::Flatten(string2);
+
+  UCollationResult result;
+  UErrorCode status = U_ZERO_ERROR;
+  {
     DisallowHeapAllocation no_gc;
     int32_t length1 = string1->length();
     int32_t length2 = string2->length();
@@ -578,9 +582,9 @@ RUNTIME_FUNCTION(Runtime_InternalCompare) {
     base::SmartArrayPointer<uc16> sap2;
     const UChar* string_val1 = GetUCharBufferFromFlat(flat1, &sap1, length1);
     const UChar* string_val2 = GetUCharBufferFromFlat(flat2, &sap2, length2);
-  UErrorCode status = U_ZERO_ERROR;
-  UCollationResult result =
+    result =
         collator->compare(string_val1, length1, string_val2, length2, status);
+  }
   if (U_FAILURE(status)) return isolate->ThrowIllegalOperation();
 
   return *isolate->factory()->NewNumberFromInt(result);