8255562: delete UseRDPCForConstantTableBase

Reviewed-by: simonis

Author: Xin Liu

src/hotspot/share/opto/c2_globals.hpp

@@ -360,9 +360,6 @@
           "Limit of ops to make speculative when using CMOVE")              \
           range(0, max_jint)                                                \
                                                                             \
-  product(bool, UseRDPCForConstantTableBase, false,                         \
-          "Use Sparc RDPC instruction for the constant table base.")        \
-                                                                            \
   notproduct(bool, PrintIdealGraph, false,                                  \
           "Print ideal graph to XML file / network interface. "             \
           "By default attempts to connect to the visualizer on a socket.")  \

src/hotspot/share/opto/machnode.hpp

@@ -434,7 +434,6 @@ class MachConstantBaseNode : public MachIdealNode {
 
   virtual void emit(CodeBuffer& cbuf, PhaseRegAlloc* ra_) const;
   virtual uint size(PhaseRegAlloc* ra_) const;
-  virtual bool pinned() const { return UseRDPCForConstantTableBase; }
 
   static const RegMask& static_out_RegMask() { return _out_RegMask; }
   virtual const RegMask& out_RegMask() const { return static_out_RegMask(); }

src/hotspot/share/runtime/arguments.cpp

@@ -555,6 +555,7 @@ static SpecialFlag const special_jvm_flags[] = {
   { "ForceNUMA",                     JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
   { "InsertMemBarAfterArraycopy",    JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
   { "Debugging",                     JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
+  { "UseRDPCForConstantTableBase",   JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
 
 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
   // These entries will generate build errors.  Their purpose is to test the macros.