[MemProf] Add missing header to list of installed headers. (#79413)

There were buildbot failures when running memprof tests: 
Failed Tests (12):
  MemProfiler-x86_64-linux :: TestCases/interface_test.cpp
  MemProfiler-x86_64-linux :: TestCases/log_path_test.cpp
  MemProfiler-x86_64-linux :: TestCases/memprof_merge_mib.cpp
  MemProfiler-x86_64-linux :: TestCases/memprof_profile_dump.cpp
  MemProfiler-x86_64-linux :: TestCases/profile_reset.cpp
  MemProfiler-x86_64-linux :: TestCases/unaligned_loads_and_stores.cpp
  MemProfiler-x86_64-linux-dynamic :: TestCases/interface_test.cpp
  MemProfiler-x86_64-linux-dynamic :: TestCases/log_path_test.cpp
  MemProfiler-x86_64-linux-dynamic :: TestCases/memprof_merge_mib.cpp
  MemProfiler-x86_64-linux-dynamic :: TestCases/memprof_profile_dump.cpp
  MemProfiler-x86_64-linux-dynamic :: TestCases/profile_reset.cpp
MemProfiler-x86_64-linux-dynamic ::
TestCases/unaligned_loads_and_stores.cpp

See
- https://lab.llvm.org/buildbot/#/builders/258/builds/8852
- https://lab.llvm.org/buildbot/#/builders/258/builds/12876

I suspect the failure is because when build with
-DLLVM_ENABLE_RUNTIMES=compiler-rt -DCOMPILER_RT_BUILD_SANITIZERS=OFF,
the headers sanitizer/allocator_interface.h and
sanitizer/common_interface_defs.h
are not copied to the build tree, and not installed.
But in the failed memprof tests,
sanitizer/allocator_interface.h or sanitizer/memprof_interface.h is
included.

This patch adds sanitizer/allocator_interface.h and
sanitizer/memprof_interface.h to memprof headers if
COMPILER_RT_BUILD_SANITIZERS is false.