Revert "PPC/s390: [interpreter] correctly advance over debug scaling prefixes."

This reverts commit dfdc3135.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> PPC/s390: [interpreter] correctly advance over debug scaling prefixes.
> 
> Port 7a07d74b
> 
> R=​yangguo@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
> BUG=
> LOG=N
> 
> Change-Id: I99553fde819cbdc8a12df5b82d9d7230ba4ef8b3
> Reviewed-on: https://chromium-review.googlesource.com/1042355
> Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
> Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
> Cr-Commit-Position: refs/heads/master@{#52970}

TBR=yangguo@chromium.org,michael_dawson@ca.ibm.com,jyan@ca.ibm.com,joransiu@ca.ibm.com

Change-Id: I04fadaa81a6dd124811c002ab4ffa61e3785b717
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1043025Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52971}

src/builtins/ppc/builtins-ppc.cc

@@ -859,13 +859,9 @@ static void AdvanceBytecodeOffsetOrReturn(MacroAssembler* masm,
   Label process_bytecode, extra_wide;
   STATIC_ASSERT(0 == static_cast<int>(interpreter::Bytecode::kWide));
   STATIC_ASSERT(1 == static_cast<int>(interpreter::Bytecode::kExtraWide));
-  STATIC_ASSERT(2 == static_cast<int>(interpreter::Bytecode::kDebugBreakWide));
-  STATIC_ASSERT(3 ==
-                static_cast<int>(interpreter::Bytecode::kDebugBreakExtraWide));
-  __ cmpi(bytecode, Operand(0x3));
+  __ cmpi(bytecode, Operand(0x1));
   __ bgt(&process_bytecode);
-  __ andi(r0, bytecode, Operand(0x1));
-  __ bne(&extra_wide, cr0);
+  __ beq(&extra_wide);
 
   // Load the next bytecode and update table to the wide scaled table.
   __ addi(bytecode_offset, bytecode_offset, Operand(1));

src/builtins/s390/builtins-s390.cc

@@ -869,14 +869,9 @@ static void AdvanceBytecodeOffsetOrReturn(MacroAssembler* masm,
   Label process_bytecode, extra_wide;
   STATIC_ASSERT(0 == static_cast<int>(interpreter::Bytecode::kWide));
   STATIC_ASSERT(1 == static_cast<int>(interpreter::Bytecode::kExtraWide));
-  STATIC_ASSERT(2 == static_cast<int>(interpreter::Bytecode::kDebugBreakWide));
-  STATIC_ASSERT(3 ==
-                static_cast<int>(interpreter::Bytecode::kDebugBreakExtraWide));
-  __ CmpP(bytecode, Operand(0x3));
+  __ CmpP(bytecode, Operand(0x1));
   __ bgt(&process_bytecode);
   __ beq(&extra_wide);
-  __ tmll(bytecode, Operand(0x1));
-  __ bne(&extra_wide);
 
   // Load the next bytecode and update table to the wide scaled table.
   __ AddP(bytecode_offset, bytecode_offset, Operand(1));