Revert of PPC: [compiler] Add relocatable pointer constants for wasm memory references.

src/compiler/ppc/code-generator-ppc.cc

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index 55ddf7278ef60e658c9a76de57ca2ca30fc8dd84..6f1e5881eb46668bd241326d333f3451abcc7b3a 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -1848,26 +1848,10 @@
           destination->IsRegister() ? g.ToRegister(destination) : kScratchReg;
       switch (src.type()) {
         case Constant::kInt32:
-#if !V8_TARGET_ARCH_PPC64
-          if (src.rmode() == RelocInfo::WASM_MEMORY_REFERENCE) {
-            __ mov(dst, Operand(src.ToInt32(), src.rmode()));
-          } else {
-#endif
-            __ mov(dst, Operand(src.ToInt32()));
-#if !V8_TARGET_ARCH_PPC64
-          }
-#endif
+          __ mov(dst, Operand(src.ToInt32()));
           break;
         case Constant::kInt64:
-#if V8_TARGET_ARCH_PPC64
-          if (src.rmode() == RelocInfo::WASM_MEMORY_REFERENCE) {
-            __ mov(dst, Operand(src.ToInt64(), src.rmode()));
-          } else {
-#endif
-            __ mov(dst, Operand(src.ToInt64()));
-#if V8_TARGET_ARCH_PPC64
-          }
-#endif
+          __ mov(dst, Operand(src.ToInt64()));
           break;
         case Constant::kFloat32:
           __ Move(dst,