[PowerPC] Add PPC prefix to retglue ISD node. NFC. (#89771)

So that aligned with other targets.

Author: Kai Luo

llvm/lib/Target/PowerPC/PPCInstr64Bit.td

@@ -76,7 +76,7 @@ let Interpretation64Bit = 1, isCodeGenOnly = 1 in {
 let isTerminator = 1, isBarrier = 1, PPC970_Unit = 7, hasSideEffects = 0 in {
   let isReturn = 1, isPredicable = 1, Uses = [LR8, RM] in
     def BLR8 : XLForm_2_ext<19, 16, 20, 0, 0, (outs), (ins), "blr", IIC_BrB,
-                            [(retglue)]>, Requires<[In64BitMode]>;
+                            [(PPCretglue)]>, Requires<[In64BitMode]>;
   let isBranch = 1, isIndirectBranch = 1, Uses = [CTR8] in {
     let isPredicable = 1 in
       def BCTR8 : XLForm_2_ext<19, 528, 20, 0, 0, (outs), (ins), "bctr", IIC_BrB,

llvm/lib/Target/PowerPC/PPCInstrInfo.td

@@ -336,7 +336,7 @@ def PPCbctrl_load_toc_rm : SDNode<"PPCISD::BCTRL_LOAD_TOC_RM",
                                   [SDNPHasChain, SDNPOptInGlue, SDNPOutGlue,
                                    SDNPVariadic]>;
 
-def retglue       : SDNode<"PPCISD::RET_GLUE", SDTNone,
+def PPCretglue   : SDNode<"PPCISD::RET_GLUE", SDTNone,
                            [SDNPHasChain, SDNPOptInGlue, SDNPVariadic]>;
 
 def PPCtc_return : SDNode<"PPCISD::TC_RETURN", SDT_PPCTC_ret,
@@ -1299,7 +1299,7 @@ def RESTORE_CRBIT : PPCEmitTimePseudo<(outs crbitrc:$cond), (ins memri:$F),
 let isTerminator = 1, isBarrier = 1, PPC970_Unit = 7, hasSideEffects = 0 in {
   let isPredicable = 1, isReturn = 1, Uses = [LR, RM] in
     def BLR : XLForm_2_ext<19, 16, 20, 0, 0, (outs), (ins), "blr", IIC_BrB,
-                           [(retglue)]>, Requires<[In32BitMode]>;
+                           [(PPCretglue)]>, Requires<[In32BitMode]>;
   let isBranch = 1, isIndirectBranch = 1, Uses = [CTR] in {
     let isPredicable = 1 in
       def BCTR : XLForm_2_ext<19, 528, 20, 0, 0, (outs), (ins), "bctr", IIC_BrB,