Pull in r355854 from upstream llvm trunk (by Jonas Paulsson):

Pull in r355854 from upstream llvm trunk (by Jonas Paulsson):

  [RegAlloc]  Avoid compile time regression with multiple copy hints.

  As a fix for https://bugs.llvm.org/show_bug.cgi?id=40986 ("excessive
  compile time building opencollada"), this patch makes sure that no
  phys reg is hinted more than once from getRegAllocationHints().

  This handles the case were many virtual registers are assigned to the
  same physreg. The previous compile time fix (r343686) in
  weightCalcHelper() only made sure that physical/virtual registers are
  passed no more than once to addRegAllocationHint().

  Review: Dimitry Andric, Quentin Colombet
  https://reviews.llvm.org/D59201

This should fix a hang when compiling certain generated .cpp files in
the graphics/opencollada port.

PR:		236313
MFC after:	1 month
X-MFC-With:	r344779