PPC: [wasm] Fixes for embedded constant pools.

src/ppc/macro-assembler-ppc.h

Index: src/ppc/macro-assembler-ppc.h
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index cd3045e9a43c5578a0e46fac8d2bfc9cb518071a..59ea5dceeb17b3474af326b5a0a3c5b4f1367ef0 100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -403,8 +403,8 @@ class MacroAssembler : public Assembler {
 #endif
 
   // Generates function and stub prologue code.
-  void StubPrologue(int prologue_offset = 0);
-  void Prologue(bool code_pre_aging, int prologue_offset = 0);
+  void StubPrologue(Register base = no_reg, int prologue_offset = 0);
+  void Prologue(bool code_pre_aging, Register base, int prologue_offset = 0);
 
   // Enter exit frame.
   // stack_space - extra stack space, used for parameters before call to C.