libpixelflinger: Fix -Woverloaded-virtual warnings.

GGLAssembler inherits a reset method from two parent classes, but it
provides a separate reset method with a different signature, thus hiding
the inherited reset methods.

The fix is to explicitly hide the inherited reset methods as private.

Bug: 27346663
Change-Id: Ic64b00acb6d77fb791cfdeade9ef7e20148817c1
diff --git a/libpixelflinger/codeflinger/GGLAssembler.h b/libpixelflinger/codeflinger/GGLAssembler.h
index 9db20df..ecc242a 100644
--- a/libpixelflinger/codeflinger/GGLAssembler.h
+++ b/libpixelflinger/codeflinger/GGLAssembler.h
@@ -288,6 +288,14 @@
 
 
 private:
+    // GGLAssembler hides RegisterAllocator's and ARMAssemblerProxy's reset
+    // methods by providing a reset method with a different parameter set. The
+    // intent of GGLAssembler's reset method is to wrap the inherited reset
+    // methods, so make these methods private in order to prevent direct calls
+    // to these methods from clients.
+    using RegisterAllocator::reset;
+    using ARMAssemblerProxy::reset;
+
     struct tex_coord_t {
         reg_t       s;
         reg_t       t;