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rev 5188 : 8024344: PPC64 (part 112): C argument in register AND stack slot.
Summary: On PPC, the first 13 floating point arguments to C calls are passed in floating point registers. Also, all but the first 8 arguments are passed on the stack. So there can be floating point arguments that are passed on the stack and in a register. We duplicate the regs datastructure in c_calling_convention() to represent this.

@@ -3216,11 +3216,11 @@
   // Body of function which returns an OptoRegs array locating
   // arguments either in registers or in stack slots for callin
   // C.
   c_calling_convention %{
     // This is obviously always outgoing
-    (void) SharedRuntime::c_calling_convention(sig_bt, regs, length);
+    (void) SharedRuntime::c_calling_convention(sig_bt, regs, /*regs2=*/NULL, length);
   // Location of native (C/C++) and interpreter return values.  This is specified to
   // be the  same as Java.  In the 32-bit VM, long values are actually returned from
   // native calls in O0:O1 and returned to the interpreter in I0:I1.  The copying