MIPS: We should never allocate a 0-sized buffer, so never grow from 0.

src/mips64/assembler-mips64.cc

Index: src/mips64/assembler-mips64.cc
diff --git a/src/mips64/assembler-mips64.cc b/src/mips64/assembler-mips64.cc
index bc61695d314fb0ea03ba86c48eb5348ac820eedc..36e9c2d1057ef53785f9ece73f0f9c7aed06d4c0 100644
--- a/src/mips64/assembler-mips64.cc
+++ b/src/mips64/assembler-mips64.cc
@@ -2631,9 +2631,7 @@ void Assembler::GrowBuffer() {
 
   // Compute new buffer size.
   CodeDesc desc;  // The new buffer.
-  if (buffer_size_ < 4*KB) {
-    desc.buffer_size = 4*KB;
-  } else if (buffer_size_ < 1*MB) {
+  if (buffer_size_ < 1 * MB) {
     desc.buffer_size = 2*buffer_size_;
   } else {
     desc.buffer_size = buffer_size_ + 1*MB;