Fix issues with Arm's use of embedded constant pools

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index 82d786fe512b2ba98844df9793ca89d3f361ef8b..879021df3b9755b7a954ed66e6a498f4b189467b 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -792,6 +792,9 @@ 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();