build with platform assembler (#8733)

Summary:
Required for platform009, which is incompat with the centos
assembler.
author: pbrady@fb.com D29099768

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8733

Test Plan: CI

Reviewed By: pixelb

Differential Revision: D30687156

Pulled By: jay-zhuang

fbshipit-source-id: 796f90842cbf0ca11bad07e7d654bce1fafc4ba0

build_tools/fbcode_config_platform009.sh

@@ -102,6 +102,7 @@ export PORTABLE
 
 BINUTILS="$BINUTILS_BASE/bin"
 AR="$BINUTILS/ar"
+AS="$BINUTILS/as"
 
 DEPS_INCLUDE="$SNAPPY_INCLUDE $ZLIB_INCLUDE $BZIP_INCLUDE $LZ4_INCLUDE $ZSTD_INCLUDE $GFLAGS_INCLUDE $NUMA_INCLUDE $TBB_INCLUDE $LIBURING_INCLUDE"
 
@@ -168,4 +169,4 @@ VALGRIND_VER="$VALGRIND_BASE/bin/"
 LUA_PATH=
 LUA_LIB=
 
-export CC CXX AR CFLAGS CXXFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED VALGRIND_VER JEMALLOC_LIB JEMALLOC_INCLUDE CLANG_ANALYZER CLANG_SCAN_BUILD LUA_PATH LUA_LIB
+export CC CXX AR AS CFLAGS CXXFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED VALGRIND_VER JEMALLOC_LIB JEMALLOC_INCLUDE CLANG_ANALYZER CLANG_SCAN_BUILD LUA_PATH LUA_LIB