S390: [compiler] Add relocatable pointer constants for wasm memory references.

port 52148c41

Original Commit Message:
    Add relocatable pointers for wasm memory references that need to be updated when wasm GrowMemory is used. Code generator changes to accept relocatable constants as immediates.

R=gdeepti@google.com, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1884573003

Cr-Commit-Position: refs/heads/master@{#35426}

src/compiler/s390/code-generator-s390.cc

@@ -1906,10 +1906,26 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
           destination->IsRegister() ? g.ToRegister(destination) : kScratchReg;
       switch (src.type()) {
         case Constant::kInt32:
+#if !V8_TARGET_ARCH_S390X
+          if (src.rmode() == RelocInfo::WASM_MEMORY_REFERENCE) {
+            __ mov(dst, Operand(src.ToInt32(), src.rmode()));
+          } else {
+            __ mov(dst, Operand(src.ToInt32()));
+          }
+#else
           __ mov(dst, Operand(src.ToInt32()));
+#endif  // V8_TARGET_ARCH_S390X
           break;
         case Constant::kInt64:
+#if V8_TARGET_ARCH_S390X
+          if (src.rmode() == RelocInfo::WASM_MEMORY_REFERENCE) {
+            __ mov(dst, Operand(src.ToInt64(), src.rmode()));
+          } else {
+            __ mov(dst, Operand(src.ToInt64()));
+          }
+#else
           __ mov(dst, Operand(src.ToInt64()));
+#endif  // V8_TARGET_ARCH_S390X
           break;
         case Constant::kFloat32:
           __ Move(dst,