Fix issues with Arm's use of embedded constant pools

src/mips64/assembler-mips64.h

Index: src/mips64/assembler-mips64.h
diff --git a/src/mips64/assembler-mips64.h b/src/mips64/assembler-mips64.h
index 9aabe1b3164518eaa78be7400b7ae081821d91eb..aba9c292be0f78c24fa85d5f166cee286df6f80f 100644
--- a/src/mips64/assembler-mips64.h
+++ b/src/mips64/assembler-mips64.h
@@ -595,6 +595,9 @@ class Assembler : public AssemblerBase {
   // possible to align the pc offset to a multiple
   // of m. m must be a power of 2 (>= 4).
   void Align(int m);
+  // Insert the smallest number of zero bytes possible to align the pc offset
+  // to a mulitple of m. m must be a power of 2 (>= 2).
+  void DataAlign(int m);
   // Aligns code to something that's optimal for a jump target for the platform.
   void CodeTargetAlign();