Merging r338627:

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r338627 | mgorny | 2018-08-01 22:38:22 +0200 (Wed, 01 Aug 2018) | 7 lines

[test] Fix %hmaptool path for standalone builds

Fix %hmaptool path to refer to clang_tools_dir instead of
llvm_tools_dir, in order to fix standalone builds.  The tool is built
as part of clang, so it won't be found in installed LLVM tools.

Differential Revision: https://reviews.llvm.org/D50156
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_70@339102 91177308-0d34-0410-b5e6-96231b3b80d8