[thirdparty] fix building LLVM 9 with GCC 10

This patch fixes LLVM 9 build with GCC 10 in Kudu's thirdparty.  The
imported patch is already in the LLVM repo, see [1].

Prior to this patch, LLVM9 build in thirdparty would fail with the
following error:

  thirdparty/src/llvm-9.0.0.src/include/llvm/Demangle/MicrosoftDemangleNodes.h:566:3: error: unknown type name 'uint32_t'
    uint32_t NVOffset = 0;
    ^

[1] https://github.com/llvm-mirror/llvm/commit/e0402b5c9813a2458b8dd3f640883110db280395

Change-Id: I3332556229dbf2bce65d52f37c48d62624465f70
Reviewed-on: http://gerrit.cloudera.org:8080/17627
Tested-by: Kudu Jenkins
Reviewed-by: Andrew Wong <awong@cloudera.com>
2 files changed