Fix new snapshot compilation on ARM.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
===================================================================
--- src/arm/assembler-arm.h	(revision 3184)
+++ src/arm/assembler-arm.h	(working copy)
@@ -439,16 +439,13 @@
 
   // This sets the branch destination (which is in the constant pool on ARM).
   // This is for calls and branches within generated code.
-  inline static void set_target_at(Address constant_pool_entry,
-                                   Address target) {
-    set_target_address_at(constant_pool_entry, target);
-  }
+  inline static void set_target_at(Address constant_pool_entry, Address target);
 
   // This sets the branch destination (which is in the constant pool on ARM).
   // This is for calls and branches to runtime code.
   inline static void set_external_target_at(Address constant_pool_entry,
                                             Address target) {
-    set_target_address_at(constant_pool_entry, target);
+    set_target_at(constant_pool_entry, target);
   }
 
   // Here we are patching the address in the constant pool, not the actual call