[compiler] Fix BasicBlock::Print()

It printed the pointer instead of the block and when run from gdb the
output was swallowed because there was no newline.

Change-Id: I55cdd3c791ff639d5b81e480aef77ac211490f77
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2799357
Commit-Queue: Georg Neis <neis@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73768}

src/compiler/schedule.cc

@@ -104,7 +104,7 @@ BasicBlock* BasicBlock::GetCommonDominator(BasicBlock* b1, BasicBlock* b2) {
   return b1;
 }
 
-void BasicBlock::Print() { StdoutStream{} << this; }
+void BasicBlock::Print() { StdoutStream{} << *this << "\n"; }
 
 std::ostream& operator<<(std::ostream& os, const BasicBlock& block) {
   os << "B" << block.id();