Add empty implementation of pure virtual RegisterContext::InvalidateAllRegisters.

This patch simply allows the tree to build.  A proper implementation still needs
to be provided.

llvm-svn: 123504
diff --git a/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.cpp b/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.cpp
index da6ea8d..27cd6c6 100644
--- a/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.cpp
+++ b/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.cpp
@@ -423,6 +423,11 @@
 {
 }
 
+void
+RegisterContextLinux_x86_64::InvalidateAllRegisters()
+{
+}
+
 size_t
 RegisterContextLinux_x86_64::GetRegisterCount()
 {
diff --git a/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.h b/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.h
index dc421ec..876d685 100644
--- a/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.h
+++ b/lldb/source/Plugins/Process/Linux/RegisterContextLinux_x86_64.h
@@ -26,6 +26,9 @@
     void
     Invalidate();
 
+    void
+    InvalidateAllRegisters();
+
     size_t
     GetRegisterCount();