rt: Remove arbitrary limit on size of port queue. Closes #1245

Author: brson

src/rt/circular_buffer.cpp

@@ -139,7 +139,6 @@ circular_buffer::dequeue(void *dst) {
 void
 circular_buffer::grow() {
     size_t new_buffer_sz = _buffer_sz * 2;
-    I(kernel, new_buffer_sz <= MAX_CIRCULAR_BUFFER_SIZE);
     KLOG(kernel, mem, "circular_buffer is growing to %d bytes",
          new_buffer_sz);
     void *new_buffer = kernel->malloc(new_buffer_sz,

src/rt/circular_buffer.h

@@ -8,7 +8,6 @@
 class
 circular_buffer : public kernel_owned<circular_buffer> {
     static const size_t INITIAL_CIRCULAR_BUFFER_SIZE_IN_UNITS = 8;
-    static const size_t MAX_CIRCULAR_BUFFER_SIZE = 1 << 24;
 
 public:
     rust_kernel *kernel;