Implement catch on ARM.

runtime/vm/assembler_arm.cc

Index: runtime/vm/assembler_arm.cc
===================================================================
--- runtime/vm/assembler_arm.cc	(revision 21707)
+++ runtime/vm/assembler_arm.cc	(working copy)
@@ -1261,6 +1261,14 @@
 }
 
 
+void Assembler::LoadPoolPointer() {
+  const intptr_t object_pool_pc_dist =
+     Instructions::HeaderSize() - Instructions::object_pool_offset() +
+     CodeSize() + Instr::kPCReadOffset;
+  LoadFromOffset(kLoadWord, PP, PC, -object_pool_pc_dist);
+}
+
+
 void Assembler::LoadObject(Register rd, const Object& object) {
   // Smis and VM heap objects are never relocated; do not use object pool.
   if (object.IsSmi()) {
@@ -1972,10 +1980,7 @@
   }
 
   // Setup pool pointer for this dart function.
-  const intptr_t object_pool_pc_dist =
-     Instructions::HeaderSize() - Instructions::object_pool_offset() +
-     CodeSize() + Instr::kPCReadOffset;
-  ldr(PP, Address(PC, -object_pool_pc_dist));
+  LoadPoolPointer();
 
   // Reserve space for locals.
   AddImmediate(SP, -frame_size);
@@ -2000,10 +2005,7 @@
   EnterFrame(regs, 0);
   if (uses_pp) {
     // Setup pool pointer for this stub.
-    const intptr_t object_pool_pc_dist =
-       Instructions::HeaderSize() - Instructions::object_pool_offset() +
-       CodeSize() + Instr::kPCReadOffset;
-    ldr(PP, Address(PC, -object_pool_pc_dist));
+    LoadPoolPointer();
   }
 }