PPC: Fix simulator and re-enable wasm tests.

src/ppc/simulator-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdarg.h>
 #include <stdlib.h>
 #include <cmath>
 
 #if V8_TARGET_ARCH_PPC
 
@@ skipping 3843 matching lines @@
 
 // Prepare to execute the code at entry
 #if ABI_USES_FUNCTION_DESCRIPTORS
   // entry is the function descriptor
   set_pc(*(reinterpret_cast<intptr_t*>(entry)));
 #else
   // entry is the instruction address
   set_pc(reinterpret_cast<intptr_t>(entry));
 #endif
 
+  // Put target address in ip (for JS prologue).
+  set_register(r12, get_pc());
+
   // Put down marker for end of simulation. The simulator will stop simulation
   // when the PC reaches this value. By saving the "end simulation" value into
   // the LR the simulation stops when returning to this call point.
   special_reg_lr_ = end_sim_pc;
 
   // Remember the values of non-volatile registers.
   intptr_t r2_val = get_register(r2);
   intptr_t r13_val = get_register(r13);
   intptr_t r14_val = get_register(r14);
   intptr_t r15_val = get_register(r15);
@@ skipping 163 matching lines @@
   uintptr_t* stack_slot = reinterpret_cast<uintptr_t*>(current_sp);
   uintptr_t address = *stack_slot;
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // USE_SIMULATOR
 #endif  // V8_TARGET_ARCH_PPC