PPC/s390: [codegen] Assert that RegisterArray has only unique registers

Port 032ab3d2

R=cbruni@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I075377afc65999731223f4dce368e6aca4e784ba
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2920810Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74834}

src/codegen/ppc/interface-descriptors-ppc-inl.h

@@ -21,11 +21,13 @@ constexpr auto CallInterfaceDescriptor::DefaultRegisterArray() {
 
 // static
 constexpr auto WriteBarrierDescriptor::registers() {
-  return RegisterArray(r3, r4, r5, r6, r7, kReturnRegister0);
+  STATIC_ASSERT(kReturnRegister0 == r3);
+  return RegisterArray(r3, r4, r5, r6, r7);
 }
 
 // static
 constexpr auto DynamicCheckMapsDescriptor::registers() {
+  STATIC_ASSERT(kReturnRegister0 == r3);
   return RegisterArray(r3, r4, r5, r6, cp);
 }
 

src/codegen/s390/interface-descriptors-s390-inl.h

@@ -21,11 +21,13 @@ constexpr auto CallInterfaceDescriptor::DefaultRegisterArray() {
 
 // static
 constexpr auto WriteBarrierDescriptor::registers() {
-  return RegisterArray(r2, r3, r4, r5, r6, kReturnRegister0);
+  STATIC_ASSERT(kReturnRegister0 == r2);
+  return RegisterArray(r2, r3, r4, r5, r6);
 }
 
 // static
 constexpr auto DynamicCheckMapsDescriptor::registers() {
+  STATIC_ASSERT(kReturnRegister0 == r2);
   return RegisterArray(r2, r3, r4, r5, cp);
 }
 // static