Use dex_pc instead of line_number.

Change-Id: I3759319562428bccabccc66d7afd691682ecca55
diff --git a/src/shadow_frame.h b/src/shadow_frame.h
index 261875e..b1ec81f 100644
--- a/src/shadow_frame.h
+++ b/src/shadow_frame.h
@@ -32,9 +32,9 @@
     return number_of_references_;
   }
 
-  // Caller line number
-  uint32_t GetLineNumber() const {
-    return line_num_;
+  // Caller dex pc
+  uint32_t GetDexPC() const {
+    return dex_pc_;
   }
 
   // Link to previous shadow frame or NULL
@@ -82,9 +82,9 @@
     return OFFSETOF_MEMBER(ShadowFrame, method_);
   }
 
-  // Offset of line number within shadow frame
-  static size_t LineNumOffset() {
-    return OFFSETOF_MEMBER(ShadowFrame, line_num_);
+  // Offset of dex pc within shadow frame
+  static size_t DexPCOffset() {
+    return OFFSETOF_MEMBER(ShadowFrame, dex_pc_);
   }
 
   // Offset of length within shadow frame
@@ -105,7 +105,7 @@
   uint32_t number_of_references_;
   ShadowFrame* link_;
   Method* method_;
-  uint32_t line_num_;
+  uint32_t dex_pc_;
   Object* references_[];
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ShadowFrame);