Fix compilation of sanitizers in Rust containers

It's not entertirely clear why this is necessary but this is carrying
over an old `compiler-rt` patch to ensure that `compiler-rt` compiles in
our super ancient containers that we build sanitizers in. This ideally
isn't the worst thing to keep with us going forward, but we'll see!

compiler-rt/lib/asan/asan_linux.cpp

@@ -214,7 +214,7 @@ void AsanCheckIncompatibleRT() {
       // the functions in dynamic ASan runtime instead of the functions in
       // system libraries, causing crashes later in ASan initialization.
       MemoryMappingLayout proc_maps(/*cache_enabled*/true);
-      char filename[PATH_MAX];
+      char filename[4096];
       MemoryMappedSegment segment(filename, sizeof(filename));
       while (proc_maps.Next(&segment)) {
         if (IsDynamicRTName(segment.filename)) {

compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp

@@ -690,12 +690,8 @@ u32 GetNumberOfCPUs() {
   }
   internal_close(fd);
   return n_cpus;
-#elif SANITIZER_SOLARIS
-  return sysconf(_SC_NPROCESSORS_ONLN);
 #else
-  cpu_set_t CPUs;
-  CHECK_EQ(sched_getaffinity(0, sizeof(cpu_set_t), &CPUs), 0);
-  return CPU_COUNT(&CPUs);
+  return sysconf(_SC_NPROCESSORS_ONLN);
 #endif
 }
 

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp

@@ -110,6 +110,7 @@ typedef struct user_fpregs elf_fpregset_t;
 #endif
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
+#include <stdio.h>
 #include <glob.h>
 #include <obstack.h>
 #include <mqueue.h>
@@ -1012,9 +1013,9 @@ CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_level);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_type);
 
 #if SANITIZER_LINUX && (__ANDROID_API__ >= 21 || __GLIBC_PREREQ (2, 14))
-CHECK_TYPE_SIZE(mmsghdr);
-CHECK_SIZE_AND_OFFSET(mmsghdr, msg_hdr);
-CHECK_SIZE_AND_OFFSET(mmsghdr, msg_len);
+// CHECK_TYPE_SIZE(mmsghdr);
+// CHECK_SIZE_AND_OFFSET(mmsghdr, msg_hdr);
+// CHECK_SIZE_AND_OFFSET(mmsghdr, msg_len);
 #endif
 
 COMPILER_CHECK(sizeof(__sanitizer_dirent) <= sizeof(dirent));