Unbreak build by adding an implementation of PopStackFrames function.

llvm-svn: 196809

compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc

@@ -147,6 +147,14 @@ static bool MatchPc(uptr cur_pc, uptr trace_pc, uptr threshold) {
   return cur_pc - trace_pc <= threshold || trace_pc - cur_pc <= threshold;
 }
 
+void StackTrace::PopStackFrames(uptr count) {
+  CHECK(count < size);
+  size -= count;
+  for (uptr i = 0; i < size; ++i) {
+    trace[i] = trace[i + count];
+  }
+}
+
 uptr StackTrace::LocatePcInTrace(uptr pc) {
   // Use threshold to find PC in stack trace, as PC we want to unwind from may
   // slightly differ from return address in the actual unwinded stack trace.

compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h

@@ -68,6 +68,7 @@ struct StackTrace {
   void FastUnwindStack(uptr pc, uptr bp, uptr stack_top, uptr stack_bottom,
                        uptr max_depth);
   void SlowUnwindStack(uptr pc, uptr max_depth);
+  void PopStackFrames(uptr count);
   uptr LocatePcInTrace(uptr pc);
 };