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

This is a reland of dfdc3135

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}

Change-Id: I012e79ef5fbff37a8ded8c8cf5d4aaf324cd6ccb
Reviewed-on: https://chromium-review.googlesource.com/1043026Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52972}

src/builtins/ppc/builtins-ppc.cc

@@ -859,9 +859,13 @@ 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));
-  __ cmpi(bytecode, Operand(0x1));
+  STATIC_ASSERT(2 == static_cast<int>(interpreter::Bytecode::kDebugBreakWide));
+  STATIC_ASSERT(3 ==
+                static_cast<int>(interpreter::Bytecode::kDebugBreakExtraWide));
+  __ cmpi(bytecode, Operand(0x3));
   __ bgt(&process_bytecode);
-  __ beq(&extra_wide);
+  __ andi(r0, bytecode, Operand(0x1));
+  __ bne(&extra_wide, cr0);
 
   // 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

@@ -869,9 +869,13 @@ 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));
-  __ CmpP(bytecode, Operand(0x1));
+  STATIC_ASSERT(2 == static_cast<int>(interpreter::Bytecode::kDebugBreakWide));
+  STATIC_ASSERT(3 ==
+                static_cast<int>(interpreter::Bytecode::kDebugBreakExtraWide));
+  __ CmpP(bytecode, Operand(0x3));
   __ 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));