[regexp] Remove remainder of native RegExpExecStub

src/regexp/ppc/regexp-macro-assembler-ppc.cc

Index: src/regexp/ppc/regexp-macro-assembler-ppc.cc
diff --git a/src/regexp/ppc/regexp-macro-assembler-ppc.cc b/src/regexp/ppc/regexp-macro-assembler-ppc.cc
index d6af025f2ed8f10d69a72e0d5ce6ccb757f13847..5c3f8d5e39f27fa98b6f4d93e53818ebc727c2a4 100644
--- a/src/regexp/ppc/regexp-macro-assembler-ppc.cc
+++ b/src/regexp/ppc/regexp-macro-assembler-ppc.cc
@@ -38,8 +38,7 @@ namespace internal {
  * Each call to a public method should retain this convention.
  *
  * The stack will have the following structure:
- *  - fp[44]  Isolate* isolate   (address of the current isolate)
- *  - fp[40]  secondary link/return address used by native call.
+ *  - fp[40]  Isolate* isolate   (address of the current isolate)
  *  - fp[36]  lr save area (currently unused)
  *  - fp[32]  backchain    (currently unused)
  *  --- sp when called ---
@@ -81,16 +80,13 @@ namespace internal {
  *              Address start,
  *              Address end,
  *              int* capture_output_array,
+ *              int num_capture_registers,
  *              byte* stack_area_base,
- *              Address secondary_return_address,  // Only used by native call.
- *              bool direct_call = false)
+ *              bool direct_call = false,
+ *              Isolate* isolate);
  * The call is performed by NativeRegExpMacroAssembler::Execute()
  * (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro
  * in ppc/simulator-ppc.h.
- * When calling as a non-direct call (i.e., from C++ code), the return address
- * area is overwritten with the LR register by the RegExp code. When doing a
- * direct call from generated code, the return address is placed there by
- * the calling code, as in a normal exit frame.
  */
 
 #define __ ACCESS_MASM(masm_)