Encapsulated the AST ID recording a bit, this time for MIPS.

src/mips/assembler-mips.h

Index: src/mips/assembler-mips.h
===================================================================
--- src/mips/assembler-mips.h	(revision 8670)
+++ src/mips/assembler-mips.h	(working copy)
@@ -833,8 +833,18 @@
 
   // Record the AST id of the CallIC being compiled, so that it can be placed
   // in the relocation information.
-  void RecordAstId(unsigned ast_id) { ast_id_for_reloc_info_ = ast_id; }
+  void SetRecordedAstId(unsigned ast_id) {
+    ASSERT(recorded_ast_id_ == kNoASTId);
+    recorded_ast_id_ = ast_id;
+  }
 
+  unsigned RecordedAstId() {
+    ASSERT(recorded_ast_id_ != kNoASTId);
+    return recorded_ast_id_;
+  }
+
+  void ClearRecordedAstId() { recorded_ast_id_ = kNoASTId; }
+
   // Record a comment relocation entry that can be used by a disassembler.
   // Use --code-comments to enable.
   void RecordComment(const char* msg);
@@ -926,7 +936,7 @@
   // Relocation for a type-recording IC has the AST id added to it.  This
   // member variable is a way to pass the information from the call site to
   // the relocation info.
-  unsigned ast_id_for_reloc_info_;
+  unsigned recorded_ast_id_;
 
   bool emit_debug_code() const { return emit_debug_code_; }