Currently, when GeneratePrintDefinitionsForClass generates its Print
functions it uses a string literal as the newline character for all the
last lines. For example:

void TorqueGeneratedStruct<Struct, HeapObject>::StructPrint(
    std::ostream& os) {
  this->PrintHeader(os, "TorqueGeneratedStruct");
  os << "\n";
}

The last line could use a single character instead of a string,
for example:

void TorqueGeneratedStruct<Struct, HeapObject>::StructPrint(
    std::ostream& os) {
  this->PrintHeader(os, "TorqueGeneratedStruct");
  os << '\n';
}

The commit suggests changing this into a char.

Change-Id: Id7a2f5fb17108fcbb543109d18b6b474ac1c5d2d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2108546Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66788}