Fixes the last x86-64 test failure in compat.exp:

<16 x float> is 64-byte aligned (for some reason),
which gets us into the stack realignment code.  The
computation changing FP-relative offsets to SP-relative
was broken, assiging a spill temp to a location
also used for parameter passing.  This
fixes it by rounding up the stack frame to a multiple
of the largest alignment (I concluded it wasn't fixable
without doing this, but I'm not very sure.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52750 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/RegisterInfoEmitter.cpp

@@ -64,6 +64,8 @@ void RegisterInfoEmitter::runHeader(std::ostream &OS) {
      << "  virtual int getDwarfRegNumFull(unsigned RegNum, "
      << "unsigned Flavour) const;\n"
      << "  virtual int getDwarfRegNum(unsigned RegNum, bool isEH) const = 0;\n"
+     << "  virtual bool needsStackRealignment(const MachineFunction &) const\n"
+     << "     { return false; }\n"
      << "  unsigned getSubReg(unsigned RegNo, unsigned Index) const;\n"
      << "};\n\n";