PPC: [regexp] Use cmp to compare large backtrack_limit inputs

cmpi only takes in a 16 bit signed integer. For larger
inputs we must use cmp with a register input.

Change-Id: I318d714930553fbad4c34097c7530055308f331a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2490460Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70689}

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

@@ -177,7 +177,8 @@ void RegExpMacroAssemblerPPC::Backtrack() {
     __ LoadP(r3, MemOperand(frame_pointer(), kBacktrackCount), r0);
     __ addi(r3, r3, Operand(1));
     __ StoreP(r3, MemOperand(frame_pointer(), kBacktrackCount), r0);
-    __ cmpi(r3, Operand(backtrack_limit()));
+    __ mov(r0, Operand(backtrack_limit()));
+    __ cmp(r3, r0);
     __ bne(&next);
 
     // Backtrack limit exceeded.