Fix build rules for ppc64.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>
Change-Id: Ib4dc67fcb58d7d8f7e48752c579468229c23de52
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3375469Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#78567}

BUILD.gn

@@ -3733,8 +3733,8 @@ v8_header_set("v8_internal_headers") {
     ]
   } else if (v8_current_cpu == "ppc64") {
     sources += [  ### gcmole(arch:ppc64) ###
-      "src/baseline/s390/baseline-assembler-s390-inl.h",
-      "src/baseline/s390/baseline-compiler-s390-inl.h",
+      "src/baseline/ppc/baseline-assembler-ppc-inl.h",
+      "src/baseline/ppc/baseline-compiler-ppc-inl.h",
       "src/codegen/ppc/assembler-ppc-inl.h",
       "src/codegen/ppc/assembler-ppc.h",
       "src/codegen/ppc/constants-ppc.h",