[compiler][backend][arm] Fix incorrect stack adjustment

- Stack adjustment was in slots, when it should be in bytes.

Bug: v8:11391
Change-Id: Ia791f2b637337279be62d66377f9b5be35f31839
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2674062Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72515}

src/compiler/backend/arm/code-generator-arm.cc

@@ -1771,7 +1771,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       // the slot allocator reclaimed other padding slots. Adjust the stack
       // here to skip any gap.
       if (slots > pushed_slots) {
-        __ AllocateStackSpace(slots - pushed_slots);
+        __ AllocateStackSpace((slots - pushed_slots) * kSystemPointerSize);
       }
       switch (rep) {
         case MachineRepresentation::kFloat32:

test/cctest/cctest.status

@@ -293,8 +293,6 @@
 ['arch == arm and not simulator_run', {
   # crbug.com/v8/7605
   'test-heap/OutOfMemorySmallObjects': [SKIP],
-  # TODO(v8:11391)
-  'test-code-generator/Regress_1171759': [SKIP],
 }],  # 'arch == arm and not simulator_run'
 
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