PPC/s390x: [wasm][liftoff][eh] Implement catch with immediate

Port 3e689a7d

Original Message:
  Only support empty exceptions for now. Unpacking i32s, and
  eventually
  arbitrary types, will be done in separate CLs.

Bug: v8:11453
Change-Id: I4f019330bfb1753b424ef3a8c541054f5fa27e84
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2760777Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73404}

src/wasm/baseline/ppc/liftoff-assembler-ppc.h

@@ -120,6 +120,11 @@ void LiftoffAssembler::LoadTaggedPointer(Register dst, Register src_addr,
   bailout(kUnsupportedArchitecture, "LoadTaggedPointer");
 }
 
+void LiftoffAssembler::LoadFullPointer(Register dst, Register src_addr,
+                                       int32_t offset_imm) {
+  bailout(kUnsupportedArchitecture, "LoadFullPointer");
+}
+
 void LiftoffAssembler::StoreTaggedPointer(Register dst_addr,
                                           Register offset_reg,
                                           int32_t offset_imm,

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -220,6 +220,12 @@ void LiftoffAssembler::LoadTaggedPointer(Register dst, Register src_addr,
       MemOperand(src_addr, offset_reg == no_reg ? r0 : offset_reg, offset_imm));
 }
 
+void LiftoffAssembler::LoadFullPointer(Register dst, Register src_addr,
+                                       int32_t offset_imm) {
+  UseScratchRegisterScope temps(this);
+  LoadU64(dst, MemOperand(src_addr, offset_imm), r1);
+}
+
 void LiftoffAssembler::StoreTaggedPointer(Register dst_addr,
                                           Register offset_reg,
                                           int32_t offset_imm,