PPC/s390: Remove many superfluous STL includes in headers.

Port 87cf0bdd

Original Commit Message:

    Use grep to check for obviously unneeded includes. e.g. headers that
    include <vector> but does not contain "std::vector".

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

Change-Id: I404409eda1f06a98ddd162799facc8aaec74826e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3387617Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#78627}

src/codegen/ppc/assembler-ppc.h

@@ -43,7 +43,6 @@
 #include <stdio.h>
 
 #include <memory>
-#include <vector>
 
 #include "src/base/numbers/double.h"
 #include "src/codegen/assembler.h"

src/codegen/s390/assembler-s390.h

@@ -49,7 +49,6 @@
 
 #include <fcntl.h>
 #include <unistd.h>
-#include <vector>
 
 #include "src/codegen/assembler.h"
 #include "src/codegen/external-reference.h"