Fix issues with Arm's use of embedded constant pools

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 0b9577420a4f7d112b049e0b241242c72ead6c19..207b1dbf1c76284b15e64f46305cd913da034e46 100644
--- a/src/mips64/assembler-mips64.cc
+++ b/src/mips64/assembler-mips64.cc
@@ -303,6 +303,14 @@ void Assembler::Align(int m) {
 }
 
 
+void Assembler::DataAlign(int m) {
+  DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
+  while ((pc_offset() & (m - 1)) != 0) {
+    db(0);
+  }
+}
+
+
 void Assembler::CodeTargetAlign() {
   // No advantage to aligning branch/call targets to more than
   // single instruction, that I am aware of.