Revert "Verify that argument to ensureSpaceFor() is never negative"

This reverts commit 7fade6c36d721ae2df2f90199bbb504224dbf441.

Reason for revert: Leads to test failures.

Change-Id: I2f943d5fe700388e20227fbcca4ff3744197f558
diff --git a/src/main/java/com/android/tools/r8/dex/DexOutputBuffer.java b/src/main/java/com/android/tools/r8/dex/DexOutputBuffer.java
index 69f1e34..2d1da51 100644
--- a/src/main/java/com/android/tools/r8/dex/DexOutputBuffer.java
+++ b/src/main/java/com/android/tools/r8/dex/DexOutputBuffer.java
@@ -35,7 +35,6 @@
   }
 
   private void ensureSpaceFor(int bytes) {
-    assert bytes >= 0;
     if (byteBuffer.remaining() < bytes) {
       int newSize = byteBuffer.capacity() + Math.max(byteBuffer.capacity(), bytes * 2);
       CompatByteBuffer newBuffer = allocateByteBuffer(newSize);