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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.

@@ -48,11 +48,10 @@
 define_pd_global(intx,     Tier3BackEdgeThreshold,       100000);
 define_pd_global(intx,     Tier4BackEdgeThreshold,       100000);
 define_pd_global(intx,     OnStackReplacePercentage,     933  );
 define_pd_global(intx,     FreqInlineSize,               325  );
-define_pd_global(intx,     InlineSmallCode,              1000 );
 define_pd_global(uintx,    NewRatio,                     12   );
 define_pd_global(intx,     NewSizeThreadIncrease,        4*K  );
 define_pd_global(intx,     InitialCodeCacheSize,         160*K);
 define_pd_global(intx,     ReservedCodeCacheSize,        32*M );
 define_pd_global(bool,     ProfileInterpreter,           false);